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• Part of The Streets are Talking: Public Forms of Creative Expression from Around the World
• Part of The Journal of Economic Perspectives, Vol. 34, No. 1 (Winter 2020)
• Part of Cato Institute (Aug. 3, 2021)
• Part of University of California Press
• Part of Open: Smithsonian National Museum of African American History & Culture
• Part of Indiana Journal of Global Legal Studies, Vol. 19, No. 1 (Winter 2012)
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• Part of Leuven University Press
• Part of UN Secretary-General Papers: Ban Ki-moon (2007-2016)
• Part of Perspectives on Terrorism, Vol. 12, No. 4 (August 2018)
• Part of Leveraging Lives: Serbia and Illegal Tunisian Migration to Europe, Carnegie Endowment for International Peace (Mar. 1, 2023)
• Part of UCL Press

Harness the power of visual materials—explore more than 3 million images now on JSTOR.

Enhance your scholarly research with underground newspapers, magazines, and journals.

Explore collections in the arts, sciences, and literature from the world’s leading museums, archives, and scholars.

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Library Research Guide for the History of Science: Introduction

• What is a Primary Source?
• Senior Theses 2023
• Background and Context/Biography
• Exploring Your Topic
• Using HOLLIS
• What is a Secondary Source?

Page Contents

Knowing a primary source when you see one, kinds of primary sources, find primary sources in hollis, using digital libraries and collections online, using bibliographies.

• Exploring the Special Collections at Harvard
• Citing Sources & Organizing Research

Primary sources provide first-hand testimony or direct evidence concerning a topic under investigation. They are created by witnesses or recorders who experienced the events or conditions being documented.

Often these sources are created at the time when the events or conditions are occurring, but primary sources can also include autobiographies, memoirs, and oral histories recorded later.

Primary sources are characterized by their content, regardless of the format available. (Handwritten notes could be published; the published book might be digitized or put on microfilm, but those notes are still primary sources in any format).

Some types of primary sources:

• Original documents (excerpts or translations acceptable): Diaries, speeches, manuscripts, letters, interviews, news film footage, contemporary newspaper articles, autobiographies, official records, pamphlets, meeting notes, photographs, contemporary sketches
• Creative works : Poetry, drama, novels, music, art 
• Relics or artifacts : Furniture, clothing, buildings

Examples of primary sources include:

• A poster from the Brotherhood of Sleeping Car Porters' 1962 strike
• The papers of William James
• A 1970 U.S. State Dept document updating Nixon on U.S.-Soviet space cooperation activities (Harvard login)
• A British pamphlet: "Electric Lighting for Country Houses," 1898
• Phineas Gage's skull
• The text of J. Robert Oppenheimer's "Atomic Weapons" presentation to the American Philosophical Society

Outline of Primary Sources for History

Archives and Manuscripts

Archives and manuscripts are the unpublished records of persons (letters, notes, diaries, etc.) and organizations. What are Archives?   Usually each archival collection has a (short) catalog record and a detailed finding aid (which is often available online).

• "Catalog record” refers to the kind of record found in library online catalogs, similar to those for books, although often a bit longer. Example of an Archive record .
• “Finding aid” (sometimes called an inventory) generally refers to a list of the folder labels for the collection, accompanied by a brief collection overview (scope and contents note) and a biographical (or institutional) note on the creator of the collection.  Finding aids may be as long as needed given the size of the collection.  They vary considerably according to the practices of individual repositories. Example of a Finding aid .

To find  Archives and manuscripts  at Harvard, go to  HOLLIS Advanced search .  Search your keywords or Subject terms (see the  HOLLIS page of this guide ) in the Library Catalog, limiting to Resource Type: Archives/Manuscripts.  You can choose the library at the right (Search Scope).  Countway  Medicine has abundant medical archives, and Schlesinger has many archives of women activists, many in health and reproductive rights fields.    Sample search on Subject: Women health .

Library Research Guide for Finding Manuscripts and Archival Collections explains

• How to find archives and manuscripts at Harvard
• How to find archives and manuscripts elsewhere in US via search tools and via subject guides .
• How to find archives and manuscripts in Europe and elsewhere.
• Requesting digitization of archival material from Harvard and from other repositories .

For digitized archival material together with other kinds of primary sources:

• Finding Primary Sources Online offers general instructions for finding primary sources online and a list of resources by region and country
• Online Primary Source Collections for the History of Science lists digital collections at Harvard and beyond by topic.
• Online Primary Source Collections for History lists digital collections at Harvard and beyond by topic.

Methods for finding books are described under the HOLLIS page  of this guide and in the Finding Primary Sources in HOLLIS box on this page. 

• Book Reviews may give an indication as to how a scientific work was received. See:   Finding Book Reviews . 
• Numerous, especially pre-1923 books (as well as periodicals and other sources) can be found and full text searched in several digital libraries (see box on this page).

Periodicals

Scientific articles :

Web of Science Citation Indexes (Harvard Login)  (1900- ) articles in all areas of science. Includes medical articles not in PubMed. You can use the Cited Reference search in the Web of Science to find primary source articles that cite a specified article, thus getting an idea of its reception. More information on the Web of Science .

PubMed (1946- ) covers, usually with abstracts, periodical articles on all areas of medicine. - --Be sure to look at the MeSH (Medical Subject Headings)  at the bottom of pertinent records. Very recent articles may not as yet received their MeSH terms.  So look at older records to find the MeSH terms, and use a variety of keywords as well as MeSH terms to find the new records. --​The MeSH terms are the same as the Medical Subject terms found in HOLLIS. --Hit Free article or Try Harvard Library, not the publisher's name to see full text

JSTOR (Harvard Login)  offers full-text of complete runs (up to about 5 years ago) of over 400 journals. JSTOR allows simultaneous or individual searching, full-text searching optional, numerous journals in a variety of fields of science and medicine. See the list at the bottom of the Advanced search screen. JSTOR searches the "Notes and News" sections of journals ( Science is especially rich in this material). In Advanced Search choose Item Type: Miscellaneous to limit largely to "Notes and News".

PsycINFO) (Harvard Login)  (1872- ) indexes the professional and academic literature in psychology and related disciplines

Many more scientific periodical indexes are listed in the Library Research Guide for the History of Science .

General interest magazines and periodicals see:

American Periodicals Series Online (Harvard Login)  (1740-1900) offers full text of about 1100 American periodicals. Includes several scientific and medical journals including the American Journal of Science and the Medical Repository. In cases where a periodical started before 1900, coverage is included until 1940.

British Periodicals (Harvard Login)  (1681-1920) offers full text for several hundred British periodicals.

Ethnic NewsWatch (Harvard Login)  (1959- ) is a full text database of the newspapers, magazines, and journals of the ethnic, minority and native press.

Periodicals Index Online (Harvard Login)  indexes contents of thousands of US and European journals in the humanities and social sciences, from their first issues to 1995.

Reader's Guide Retrospective (WilsonWeb) (Harvard Login)  (1890-1982)  indexes many American popular periodicals.

Many more general periodical indexes are listed in Finding Articles in General and Popular Periodicals (North America and Western Europe) .

Articles in non-science fields (religion, public policy): see the list in the Library Research Guide for History .

Professional/Trade : Aimed at particular trades or professions.  See the Library Research Guide for History

Newspaper articles : see the Guide to Newspapers and Newspaper Indexes .

Personal accounts . These are first person narratives recalling or describing a person’s life and opinions. These include Diaries, memoirs, autobiographies, and when delivered orally and recorded: Oral histories and Interviews.

National Library of Medicine Oral Histories

Regulatory Oral History Hub  (Kenan Institute for Ethics, Duke University) offers links to digital collections containing interviews with regulators, lawyers, and judges. Mainly U.S.

Visual sources :

Records for many, but by no means all, individual Harvard University Library images are available in  HOLLIS Images , an online catalog of images. Records include subjects and a thumbnail image.  HOLLIS Images is included in HOLLIS  searches.

Science & Society Picture Library offers over 50,000 images from the Science Museum (London), the National Museum of Photography, Film & Television and the National Railway Museum.

Database of Scientific Illustrators  (DSI) includes over 12500 illustrators in natural history, medicine, technology and various sciences worldwide, c.1450-1950. Living illustrators excluded. 

NYPL Digital Gallery Pictures of Science: 700 Years of Scientific and Medical Illustration

Images from the History of Medicine (IHM) includes prints and photographs from the U.S. National Library of Medicine. (The IHM is contained within a larger NLM image database, so this link goes to a specialized search).

Images From the History of the Public Health Service: a Photographic Exhibit .

Wellcome Images

Films/Videos

To find films in  HOLLIS , search your topic keywords, then on the right side of the results screen, look at Resource Type and choose video/film.

To find books about films about your topic, search your topic keywords AND "in motion pictures" ​  (in "")

​Film Platform  offers numerous documentary films on a wide variety of subjects.  There are collections on several topics. Searches can be filtered by topic, country of production, and language. 

A list of general sources for images and film is available in the Library Research Guide for History and additional sources for the history of science in Library Research Guide for the History of Science .

Government documents often concern matters of science and health policy.  For Congressional documents, especially committee reports, see ProQuest Congressional (Harvard Login ). 

HathiTrust Digital Library . Each full text item is linked to a standard library catalog record, thus providing good metadata and subject terms. The catalog can be searched separately.  Many government documents are full text viewable.  Search US government department as Author.

More sources are listed in the Library Research Guide for History

For artifacts and other objects , the Historic Scientific Instruments Collection in the Science Center includes over 15,000 instruments, often with contemporary documentation, from 1450 through the 20th century worldwide.

Waywiser, online database of the Collection of Historical Scientific Instruments .

Warren Anatomical Museum of the Center for the History of Medicine in the Countway Library of Medicine has a rich collection of medical artifacts and specimens.

Peabody Museum of Archaeology and Ethnology

Fall 2020: these collections are closed during the pandemic. Check out their links above to see what they have available online.

Primary Source Terms :

You can limit HOLLIS  searches to your time period, but sources may be published later, such as a person's diary published posthumously. Find these with these special Subject terms.

You can use the following terms to search HOLLIS for primary sources:

• Correspondence
• Description and travel
• Manuscripts
• Notebooks, sketchbooks, etc.
• Personal narratives (refers to accounts of wars and diseases only)
• Pictorial works
• Sources (usually refers to collections of published primary sources)

Include these terms with your topical words in HOLLIS searches. For example: tuberculosis personal narratives

Online Primary Source Collections for the History of Science lists digital collections at Harvard and beyond by topic

Google Book Search, HathiTrust Digital Library and Internet Archives offer books and periodicals digitized from numerous libraries.  Only out-of-copyright, generally post-1923, books are fully viewable.  Each of these three digital libraries allows searching full text over their entire collections.

Google Book Search

HathiTrust Digital Library . Each full text item is linked to a standard library catalog record, thus providing good metadata and subject terms. The catalog can be searched separately.  Many post-1923 out-of-copyright books, especially government documents, are full text viewable. You can search within copyright books to see what page your search term is on.

Internet Archive now offers a beta full text search. Put your terms (phrases or personal names, in quotation marks (""), work best) in the search box. 

The Online Books Page arranges electronic texts by Library of Congress call numbers and is searchable (but not full text searchable).  Includes books not in Google Books, HathiTrust, or Internet Archive. Has many other useful features.

Medical Heritage Library . Information about the Medical Heritage Library. Now searchable full text.

UK Medical Heritage Library

Biodiversity Heritage Library

Contagion: Historical Views of Diseases and Epidemics (1493-1922) provides digitized historical, manuscript, and image resources selected from Harvard University libraries and archives.

Expeditions and Discoveries (1626-1953) features nine expeditions in anthropology and archaeology, astronomy, botany, and oceanography in which Harvard University played a significant role. Includes manuscripts and records, published materials, visual works, and maps from 14 Harvard repositories.

Defining Gender Online: Five Centuries of Advice Literature for Men and Women (1450-1910).

Twentieth Century Advice Literature: North American Guides on Race, Sex, Gender, and the Family.

Many more general History digital libraries and collections: Library Research Guide for History

More History of Science digital libraries: Library Research Guide for the History of Science .

There may already be a detailed list of sources (a bibliography) for your topic.

For instance:

A bibliography of eugenics , by Samuel J. Holmes ... Berkeley, Calif., University of California press, 1924, 514 p. ( University of California publications in zoology . vol. XXV)  Full text online .

Look for specialized subject bibliographies in HOLLIS Catalog . Example .   WorldCat can do similar searches in the Subject Keyword field for non-Harvard holdings.

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• Last Updated: Mar 9, 2024 8:13 PM
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Harvard University Digital Accessibility Policy

• Primary Sources
• Definitions
• Documents - Printed & Published
• Objects and Artifacts
• Sound Recordings
• Visual Materials
• Digitized Sources
• Locating Sources
• Sources By Subject
• Evaluating Sources
• Documenting Sources / Copyright
• Research Tips
• Using Archives This link opens in a new window

Primary Sources Definition

What are primary sources .

Primary sources enable the researcher to get as close as possible to the truth of what actually happened during an historical event or time period. Primary source is a term used in a number of disciplines to describe source material that is closest to the person, information, period, or idea being studied.  A primary source (also called original source ) is a document, recording, artifact, or other source of information that was created at the time under study, usually by a source with direct personal knowledge of the events being described. It serves as an original source of information about the topic.

Similar definitions are used in library science , and other areas of scholarship. In journalism, a primary source can be a person with direct knowledge of a situation, or a document created by such a person. Primary sources are distinguished from secondary sources , which cite, comment on, or build upon primary sources, though the distinction is not a sharp one.

Newspaper Research

• Historical Newspapers (ProQuest) This link opens in a new window Includes the New York Times, Chicago Tribune, LA Times, Christian Science Monitor, and more. Newspapers are in PDF format and provide a visual representation of the newspaper.
• ProQuest Central This link opens in a new window Includes both newspapers and scholarly journals
• Historical Newspapers The Guardian and The Observer Search The Guardian (1821-2003) and its sister paper, The Observer (1791-2003)
• New York Newspaper Archive This link opens in a new window Access New York Newspaper Archives and discover stories of the past with NewspaperArchive.com. The archive covers New York history from 1753-2023, with lots of content from smaller, local newspapers. Articles have been scanned as PDFs and include images and advertisements, and are full text searchable.
• America's Historical Newspapers This link opens in a new window America's Historical Newspapers includes articles from local and regional American and Hispanic American newspapers from all 50 states. Coverage dates from 1690 to the early 20th century. Articles have been scanned as PDFs and include images and advertisements, and are full text searchable.
• American Periodicals Series Online This link opens in a new window includes digitized images of the pages of American magazines and journals published from colonial days to the dawn of the 20th century, 1740-1940.
• Times Digital Archive (London) This link opens in a new window Provides full-text access to back issues of The Times newspaper. Dates of coverage: 1785 to 2006.
• Hispanic American Newspapers, 1808-1980 This link opens in a new window Hispanic American Newspapers, 1808-1980 provides access to searchable digitized copies of newspapers printed in the U.S. during the 19th and 20th centuries for a Hispanic readership. It features hundreds of monolingual and bilingual newspapers in Spanish and English, including many obscure titles from the 19th century.
• Global Newsstream This link opens in a new window Full text of 300+ U.S. and international news sources. Includes coverage of 150+ major U.S. and international newspapers such as The New York Times and the Times of London, plus hundreds of other news sources and news wires.
• Gale Newspaper Sources This link opens in a new window The Gale NewsVault is a portal to several historical collections of British newspapers and periodicals. It enables full-text searching across several titles simultaneously, including the Times of London, Financial Times, and Times Literary Supplement, along with aggregate newspaper and periodical collections covering the 17th, 18th, and 19th centuries.
• Access World News This link opens in a new window Access World News provides the html full text and, for some titles, the pdf "as printed" visual representation, of articles from a variety of national and international news sources, including newspapers, digital-native news websites, television and radio transcripts, blogs, college and university newspapers, journals, magazines, and some audio and video. Most international titles are English language. Dates of coverage vary from title to title, but primarily span the late 20th century to present.

The Billy Rose Theatre Collection

TITLE: [Scene from Othello with Paul Robeson as Othello and Uta Hagen as Desdemona, Theatre Guild Production, Broadway, 1943-44]   http://commons.wikimedia.org/wiki/File:Robeson_Hagen_Othello.jpg SOURCE:Prints and Photographs Division Washington, D.C. 20540

The Billy Rose Theatre Collection of The New York Public Library is one of the largest and most comprehensive archives devoted to the theatrical arts. This image is a work of an employee of the United States Farm Security Administration or Office of War Information domestic photographic units, created during the course of the person's official duties. As a work of the U.S. federal government, the image is in the public domain.

• Billy Rose Collection NYPL The Billy Rose Theatre Division of The New York Public Library is one of the largest and most comprehensive archives devoted to the theatrical arts.
• New York Public Library Archives & Manuscripts On this site, you can search The New York Public Library's vast holdings, initiate a research visit, submit a query to an archivist, and access digitized material. Most Broadway shows can be viewed in the special collections. You will need a NYPL library card to view them.
• ArchiveGrid This link opens in a new window Thousands of libraries, museums, and archives have contributed nearly a million collection descriptions to ArchiveGrid.
• WorldCat - FirstSearch (OCLC) This link opens in a new window Search for books and more in libraries in the U.S. and around the world. Indicates when NYU Libraries holds a copy of a book and shows you nearby libraries with holdings.
• Internet Archive Internet Archive is a non-profit digital library offering free universal access to books, movies & music, as well as 456 billion archived web pages.
• Archives Unbound This link opens in a new window NYU is currently subscribing 14 collections:African America, Communists, and the National Negro Congress; Federal Response to Radicalism; Federal Surveillance of African Americans; Feminism in Cuba - 19th through 20th century archival document; Global Missions and Theology; India from Crown Rule to Republic; Testaments to the Holocaust (Documents and Rare Printed Materials from the Wiener Library, London); The Hindu Conspiracy Cases (Activities of the Indian Independence Movement in the U.S., 1908-1933); The Indian Army and Colonial Warfare on the Frontiers of India; The International Women’s Movement (The Pan Pacific Southeast Asia Women’s Association of the USA, 1950-1985); The Middle East Online - Arab-Israeli Relations; The Middle East Online - Iraq; U.S. and Iraqi Relations: U.S. Technical Aid; and, Witchcraft in Europe.

Historical Databases

An advert for P.T. Barnum's "Feejee Mermaid" in 1842 or thereabout. Author: P. T. Barnum or an employee, Source: Newspaper advert commons.wikimedia.org/ wiki/File:Barnum_mermai... This image (or other media file) is in the public domain because its copyright has expired.

• America: History and Life with Full Text This link opens in a new window ndexes literature covering the history and culture of the United States and Canada, from prehistory to the present. The database indexes 1,700 journals and also includes citations and links to book and media reviews. Strong English-language journal coverage is balanced by an international perspective on topics and events, including abstracts in English of articles published in more than 40 languages. Publication dates of coverage: 1964 to present.
• Historical Abstracts with Full Text (EBSCO) This link opens in a new window Covers the history of the world (excluding the United States and Canada) from 1450 to the present, including world history, military history, women's history, history of education, and more. Indexes more than 1,700 academic historical journals in over 40 languages. Publication dates of coverage: 1955 to present.
• Theatre in Context Collection This link opens in a new window O’Dell’s Annals of the New York Stage, the Oxford University Press Companion series, and Greenwood’s American Theatre Companies series are just a few of the many in-copyright sources included in the Theatre in Context Collection. Placed alongside thousands of playbills, posters, photographs, and related theatrical ephemera, users will be able to paint a more comprehensive picture of the life and evolution of dramatic works.
• Shakespeare Collection This link opens in a new window The Shakespeare Collection provides access to general reference data, full-text scholarly periodicals, reprinted criticism, facsimile primary source material and the full-text annotated works from The Arden Shakespeare. Users can view page images of the First Folio, key Quartos, and major editions and adaptations of Shakespeare's works, plus works by Shakespeare's contemporaries and promptbooks from the 17th to the 20th century.
• Black Thought and Culture This link opens in a new window Contains 1297 sources with 1100 authors, covering the non-fiction published works of leading African-Americans. Particular care has been taken to index this material so that it can be searched more thoroughly than ever before. Where possible the complete published non-fiction works are included, as well as interviews, journal articles, speeches, essays, pamphlets, letters and other fugitive material.
• Periodicals Archive Online This link opens in a new window Provides full-text and full-image access to hundreds of journals published in the arts, humanities, social sciences, and areas of general popular interest. Each periodical is covered back to its first issue, regardless of when it began publication. International in scope, PAO covers periodicals in a number of Western languages.
• Accessible Archives This link opens in a new window Includes the following collections: African American Newspapers, The Civil War Part I. A Newspaper Perspective, The Pennsylvania Genealogical Catalog, Pennsylvania Newspaper Record, South Carolina Newspapers, and The Liberator. ** Within these collections are papers such as The Charleston Mercury, The Christian Recorder, The Colored American, Douglass Monthly, Frederick, Douglass Paper, Freedom's Journal, Godey's Lady's Book, The Liberator, The National Era, The New York Herald, The North Star, The Pennsylvania Gazette, The Pennsylvania Packet, The Maryland Gazette, Provincial Freeman, Richmond Enquirer, The South Carolina Gazette, The Gazette of the State of South Carolina, The South Carolina Gazette and Country Journal, The South Carolina and American General Gazette, Weekly Advocate.
• Early English Books Online (EEBO) This link opens in a new window Early English Books Online (EEBO) contains digital facsimile page images of virtually every work printed in England, Ireland, Scotland, Wales and British North America and works in English printed elsewhere from 1473-1700. Searchable full text is also available for a subset of the collection.
• Eighteenth Century Journals This link opens in a new window Eighteenth Century Journals brings together rare journals printed between 1685 and 1835, primarily in the British Isles (with some publications from India, the Caribbean, and Europe). Users can view and download page images and search transcribed full text for all journals in the collection.
• C19: The 19th Century Index This link opens in a new window C19: The 19th Century Index provides bibliographic coverage of nineteenth-century books, periodicals, official documents, newspapers and archives from the English-speaking world. This database includes the Wellesley Index to Victorian Periodicals (1824-1900), Poole's Index to Periodical Literature, Palmer's Index to The Times, the Nineteenth Century Short Title Catalogue, and more.
• Sixties: Primary Documents and Personal Narratives 1960 - 1974 This link opens in a new window This resource consists of diaries, letters, autobiographies and other memoirs, written and oral histories, manifestos, government documents, memorabilia, and scholarly commentary. With 150,000 pages of material at completion, this searchable collection is a resource for students and scholars researching this period in American history, culture, and politics.
• African American Archives (via Fold3) This link opens in a new window This full text resource offers access to original documents that reveal a side of the African American story that few have seen before.
• African American Experience This link opens in a new window Full-text digital resource exploring the history and culture of African Americans, as well as the greater Black Diaspora. Features access to full-text content from more than 400 titles, 3,000 slave narratives, over 2000 images, 5,000 primary sources, and 250 vetted Web sites.

Letters & Diaries /Oral Histories

• Oral History Online This link opens in a new window Provides in-depth indexing to more than 2,700 collections of Oral History in English from around the world. The collection provides keyword searching of almost 281,000 pages of full-text by close to 10,000 individuals from all walks of life.
• American Civil War: Letters and Diaries This link opens in a new window This database contains 2,009 authors and approximately 100,000 pages of diaries, letters and memoirs. Includes 4,000 pages of previously unpublished manuscripts such as the letters of Amos Wood and his wife and the diary of Maryland Planter William Claytor. The collection also includes biographies, an extensive bibliography of the sources in the database, and material licensed from The Civil War Day-by-Day by E.B. Long.
• British and Irish Women's Letters and Diaries This link opens in a new window Includes 10,000 pages of diaries and letters revealing the experiences of approximately 500 women. The collection now includes primary materials spanning more than 300 years. The collection also includes biographies and an extensive annotated bibliography of the sources in the database.
• North American Immigrant Letters, Diaries and Oral Histories This link opens in a new window North American Immigrant Letters, Diaries and Oral Histories includes 2,162 authors and approximately 100,000 pages of information, so providing a unique and personal view of what it meant to immigrate to America and Canada between 1800 and 1950. Contains contemporaneous letters, diaries, oral histories, interviews, and other personal narratives.
• North American Women's Letters and Diaries This link opens in a new window North American Women's Letters and Diaries includes the immediate experiences of 1,325 women and 150,000 pages of diaries and letters.

Gale Primary Sources

• Gale Primary Sources This link opens in a new window Gale Artemis is a groundbreaking research environment that integrates formerly disparate digital collections to enable innovative research. Gale Artemis provides an unprecedented, seamless research experience that helps students find a starting point, search across a wide array of materials and points in time, and discover new ways to analyze information.

Victorian Popular Culture

• Victorian Popular Culture An essential resource for the study of popular entertainment in the nineteenth and early twentieth centuries. This innovative portal invites users into the darkened halls, small backrooms and travelling venues that hosted everything from spectacular shows and bawdy burlesque, to the world of magic and spiritualist séances. ** The resource is divided into four self-contained sections: Moving Pictures, Optical Entertainments and the Advent of Cinema; Music Hall, Theatre and Popular Entertainment; Circuses, Sideshows and Freaks; Spiritualism, Sensation and Magic

Historical Image Collections

commons.wikimedia.org/ wiki/File:Cushman_in_Ha... , The American actress Charlotte Cushman advertised in William Shakespeare's Hamlet at the Washington Theater in 1861.  Author:Washington Theater, SOURCE:Public Library of Congress. this image (or other media file) is in the public domain because its copyright has expired.

• American Broadsides and Ephemera This link opens in a new window American Broadsides and Ephemera offers fully searchable images of approximately 15,000 broadsides printed between 1820 and 1900 and 15,000 pieces of ephemera printed between 1760 and 1900. The remarkably diverse subjects of these broadsides range from contemporary accounts of the Civil War, unusual occurrences and natural disasters to official government proclamations, tax bills and town meeting reports. Featuring many rare items, the pieces of ephemera include clipper ship sailing cards, early trade cards, bill heads, theater and music programs, stock certificates, menus and invitations documenting civic, political and private celebrations.
• Early American Imprints, Series I. Evans, 1639-1800 This link opens in a new window Search or browse the books, pamphlets, broadsides and other imprints listed in the renowned bibliography by Charles Evans.
• Early American Imprints, Series II. Shaw-Shoemaker, 1801-1819 This link opens in a new window Search or browse the books, pamphlets, broadsides and other imprints listed in the distinguished bibliography by Ralph R. Shaw and Richard H. Shoemaker. 1801-1819
• American Antiquarian Society (AAS) Historical Periodicals Collection (EBSCO) This link opens in a new window Provide digital access to the most comprehensive collection of American periodicals published between 1691 and 1877. Included digitized images of American magazines and journals never before available outside the walls of the American Antiquarian Society. The collection is available in five series: Series 1 (1691-1820) - Series 2 (1821-1837) - Series 3 (1838-1852) - Series 4 (1853-1865) - Series 5 (1866-1877)

Link to Bobst Special Collections

• NYU Special Collections Bobst Library's Special Collections department houses significant archival resources including materials from the Downtown Collection, which documents New York City's downtown arts scene from the 1970s through the early 1990s. Maria Irene Fornés and Richard Foreman are among the many artists whose materials are housed in the Downtown Collection.
• Fales It is especially strong in English literature from the middle of the 18th century to the present, documenting developments in the novel. The Downtown Collection documents the downtown New York art, performance, and literary scenes from 1975 to the present and is extremely rich in archival holdings, including extensive film and video objects.
• Tamiment One of the finest research collections in the country documenting the history of radical politics: socialism, communism, anarchism, utopian experiments, the cultural left, the New Left, and the struggle for civil rights and civil liberties.

Guide to International Collections

• SIBMAS International Directory of Performing Arts Collections and Institutions

Books Containing Primary Source Documents

• The mediaeval stage by Chambers, E. K. (Edmund Kerchever), 1866-1954 Call Number: Online versions avail.
• The Elizabethan stage by Chambers, E. K. (Edmund Kerchever), 1866-1954 Call Number: PN2589 .C4 1965 4 vol. plus online version avail
• The diary of Samuel Pepys by Pepys, Samuel, 1633-1703 Call Number: Avail. online
• A history of theatrical art in ancient and modern times. by Mantzius, Karl, 1860-1921 Call Number: PN2106 .M313 1970 4 vol. also internet access
• Ben Jonson by Ben Jonson Call Number: online access
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Introduction to primary source research, definitions, examples of primary sources by discipline, head of bancroft public services.

• Archives terminology
• How to use library catalogs
• How to use finding aids/collection guides
• How to plan your visit to an archive
• Using digitized primary sources
• Evaluating primary sources

A primary source is an eyewitness account of an event or data obtained through original statistical or scientific research. 

What are some examples of primary sources?

• Photographs
• Official records (government reports, transcripts, court records, death certificates, etc.)
• Contemporary news reports (newspapers, telecasts, radio addresses, etc.)
• Polls and Public Opinion Data
• Laws, statutes, hearings

Secondary Source

A secondary source interprets and analyzes primary sources. These sources are one or more steps removed from the event. Secondary sources may include pictures of primary sources or quotes from them. Some types of secondary sources include: journal/magazine articles, textbooks, commentaries, and encyclopedias.

Newspapers may be either primary or secondary. Most articles in newspapers are secondary, but reporters may be considered as witnesses to an event.  Any topic on the media coverage of an event or phenomenon would treat newspapers as a primary source. 

Source: https://libraries.indiana.edu/identifying-primary-and-secondary-sources

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Primary Sources Research Guide

• What Are Primary Sources?
• What Are Secondary Sources?
• Examples of Primary & Secondary Sources
• Where to Look for Primary Sources

Get Primary Sources by Subject

Many library subject guides contain sections on primary sources for those subjects. BELOW you can also see a list of research guides that have been tagged "primary sources."

Still have questions? Please get in touch with the librarian for your subject area for more information about specific primary sources in your field.

Defining Primary Sources

• Primary sources are original materials that provide direct evidence or first-hand testimony concerning a topic or event -- firsthand records created by people who actually participated in or remembered an event and reported on the event and their reactions to it.
• Primary sources can be contemporary sources created at the time when the event occurred (e.g., letters and newspaper articles) or later (such as, memoirs and oral history interviews).
• Primary sources may be published or unpublished. Unpublished sources include unique materials (e.g., family papers) often referred to as archives and manuscripts.
• What constitutes a primary source varies by discipline -- see Primary Sources by Discipline below . How the researcher uses the source generally determines whether it is a primary source or not.

*This material is used with permission from the University of Pittsburgh Library's research guide on Primary Sources

Primary Sources by Discipline

The definition of a primary source varies depending upon the academic discipline and the context in which it is used.

1. In the humanities , a primary source could be defined as something that was created either during the time period being studied or afterward by individuals reflecting on their involvement in the events of that time.

Examples from the humanities:  

Art: painting, photograph, print, sculpture, film or other work of art, sketch book, architectural model or drawing, building or structure, letter,  organizational records, personal account by artist History: artifact, diary, government report, interview, letter, map, news report, oral history, organizational records, photograph, speech, work of art Literature: interview, letter, manuscript, personal account by writer, poem, work of fiction or drama, contemporary review Music: score, sound recording, contemporary review, letter, personal account by composer or musician

2. In the social sciences , the definition of a primary source would be expanded to include numerical data that has been gathered to analyze relationships between people, events, and their environment.  

Examples from the social sciences: 

Anthropology: artifact, field notes, fossil, photograph Business: market research or surveys, anything that documents a corporation's activities, such as annual reports, meeting minutes, legal documents, marketing materials, and financial records. Communication: websites, blogs, broadcast recordings and transcripts, advertisements and commercials, public opinion polls, and magazines (e.g., Rolling Stone ). Economics: company statistics, consumer survey, data series Geography: field notes, census data, maps, satellite images, and aerial photographs. Law: code, statute, court opinion, legislative report Psychology: case study, clinical case report, experimental replication, follow-up study, longitudinal study, treatment outcome study Sociology: cultural artifact, interview, oral history, organizational records, statistical data, survey

3. In the natural sciences , a primary source could be defined as a report of original findings or ideas. These sources often appear in the form of research articles with sections on methods and results.

Examples in the natural sciences:

Biology, Chemistry, etc: research or lab notes, genetic evidence, plant specimens, technical reports, and other reports of original research or discoveries (e.g., conference papers and proceedings, dissertations, scholarly articles).

*This material is used with permission from the Lafayette College Library research guide on primary sources . Image 1: "Massachusetts Bay Colony 1776"  CC BY-NC-ND 2.0 Tom Woodward: Flickr Image 2: "data"  CC BY-NC-ND 2.0 CyberHades: Flickr Image 3: "Katydid 50x Magnification Wing, Coventry, CT"  CC BY-NC-ND 2.0 Macroscopic Solutions: Flickr

Examples of Primary Sources

Primary sources typically include such items as:

• manuscripts, letters, first-person diaries, memoirs, personal journals, interviews, speeches, oral histories, and other materials individuals used to describe events in which they were participants or observers. Many of these materials frequently are referred to as " papers ";
• records of government agencies and other organizations, including such documents as parliamentary debates, proceedings of organization meetings, conferences, etc. Many of these materials frequently are referred to as " archives ";
• original documents such as birth certificates, marriage and baptismal registers, wills, trial transcripts, etc.;
• published materials written at the time of the event, including newspapers, news magazines, advertising, cartoons, and other ephemeral publications such as pamplets and flyers;
• contemporary creative works of literature, art, and music, such as novels, paintings, compositions, poems, etc.;
• contemporary photographs, maps, audio recordings, television and radio broadcasts, and moving pictures;
• Internet communications including email, listservs, and blogs;
• statistical and numeric data collected by various government and private agencies, including census data, opinion polls, and other surveys;
• research reports and case studies in the sciences or social sciences;
• artifacts of all kinds such as coins, clothing, fossils, furniture, and musical instruments from the time period under study

Primary sources sometimes can be ambiguous and contradictory, relecting a specific person's opinions and contemporary cultural influences on them. For that very reason such sources are invaluable tools for developing your own interpretations and reaching your own conclusions about what is going on at a point in time.

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Primary Source Research and Discovery

• What are archives?
• What are primary sources?
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• How do I start?

What are Primary Sources?

Primary sources.

A primary source provides direct or firsthand evidence about an event, object, person, or work of art. Primary sources include historical and legal documents, eyewitness accounts, results of experiments, statistical data, pieces of creative writing, audio and video recordings, speeches, and art objects. Interviews, surveys, fieldwork, and Internet communications via email, blogs, listservs, and newsgroups are also primary sources. In the natural and social sciences, primary sources are often empirical studies—research where an experiment was performed or a direct observation was made. The results of empirical studies are typically found in scholarly articles or papers delivered at conferences.

Secondary Sources

Secondary sources describe, discuss, interpret, comment upon, analyze, evaluate, summarize, and process primary sources. Secondary source materials can be articles in newspapers or popular magazines, book or movie reviews, or articles found in scholarly journals that discuss or evaluate someone else's original research. 

Definition courtesy of  Ithaca College Library Research Guide , Primary vs Secondary section.

Clues for Identifying Primary Sources

Clues for identifying primary source characteristics.

Characteristics of Primary Sources

• Primary sources can either be first-hand observation/analysis or accounts contemporary with the events described.
• Primary sources document events, people, viewpoints of the time.
• When research is more era, rather than event-driven, the scope of possible primary sources broadens considerably.
• Primary sources represent one person's perspective; frequently will be used with  secondary/tertiary  sources to broaden the lens through which a researcher is looking at an event, era, or phenomenon.
• It is important when using anything as a primary source that the researcher be cognizant of and sensitive to the bias of the observer/analyzer that created the primary source, and also to the broader cultural biases of the era in which the primary source was created.
• The researcher's perspective, or the arguments or points for which a researcher plans to use a primary source as evidence, is significant in determining what sources will be primary.
• Reproductions of primary sources remain primary for many research purposes.
• Some attributes are based more on the perspective represented in the source and context in which the source is being used by researcher.

Bullet points courtesy of The University of California at Irvine Libraries .

Primary, Secondary, Tertiary Examples

Primary, secondary, tertiary sources.

The infographic below gives the definition, characteristics, and examples of primary, secondary and tertiary sources. Notice, journal articles are listed for the sciences as a primary source and a secondary source for non-scientific disciplines. At the top of the graphic is the publishing timeline . As you can see primary sources are generally published first, then secondary sources. In the research timeline , secondary sources are generally consulted first to provide needed context for primary source research.

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Primary Sources: An Introduction: Home

Primary source research, what is a primary source, is it a primary source, what are some examples of primary sources, primary sources at marquette.

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Library Liaison for History, Philosophy, Political Science, & Theology

This is introductory description of what can be considered a primary source for the purposes of a research paper. Students and faculty have access to a wide range of primary source databases. It is highly recommended that student contact a liaison librarian for a research consultation when undertaking a research project using these sources. See the link below to set up a consult:

• Schedule a Research Consultation

A primary source is a first-hand or contemporary account of an event. Primary sources date to the time an event took place and offer original account or thoughts on a topic that has not been framed by second-hand interpretation. Primary sources are usually original materials, but they may be reproduced digitally or republished in a physical format.  

This guide from Fresno State University can help you determine if something is a Primary Source.  If you answer 'yes' to any of the following questions, the resource is most like a Primary Source. 

• Did the author personally witness or experience the subject in question?
• Does the author know about this subject because of personal experience rather than having just read about it?
• Is this source a diary, letter, memoir, autobiography, oral history, or interview of a person with first hand experience of the subject?
• Is this source an official document or record published at the time of the event by the government, courts, or another organization?
• Is this source a newspaper or magazine article written at the time of the event?
• Is this a creative work such as a novel, poem, art or music piece created by a firsthand witness of the subject in question?
• Is this an excerpt from a primary source, such as the constitution or a letter written by a Civil War soldier that has been imbedded in a secondary source, such as a textbook? Remember, secondary sources may include reprints of primary sources.
• Is this an artifact or relic such as jewelry, pottery, clothing, music, art, architecture, dance or weaponry that was used by witnesses of the subject in question?
• Is this a compilation of raw scientific data or statistics, such as census statistics published by the U.S. Census Bureau, that is being published without commentary or interpretation?
•  newspapers or other news accounts
•  personal accounts in diaries, letters, interviews, or oral histories
•  government documents or publications
•  speeches
•  photographs/ video footage
•  internal organizational documents
•  memoirs or autobiographies
•  novels, poems, or other works of art

Please note that, in the correct context, many things that are typically considered to be Secondary Sources - such as autobiographies or books about an event or historical period - can also be considered primary sources. For example, if you are writing an analysis of how historians have viewed a certain event over time, written histories on the event can be used as primary sources. 

There are many resources for primary source materials at Marquette. Physical examples of these include newspaper microfilms, government or non-profit reports, reproductions of historical documents or text, and published diaries or autobiographies. The link below connects to digitized primary sources databases that can accessed by Marquette students and faculty. Please use the research consultation link above for guidance on any of these materials. 

• Digital Primary Source Materials at Marquette
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Organizing Your Social Sciences Research Paper

• Primary Sources
• Purpose of Guide
• Design Flaws to Avoid
• Independent and Dependent Variables
• Glossary of Research Terms
• Reading Research Effectively
• Narrowing a Topic Idea
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Primary sources are materials that were either created during the time period being studied or were created at a later date by a participant in the events being studied, such as, a childhood memoir. They are original documents [i.e., they are not about another document or account] and reflect the individual viewpoint of a participant or observer. Primary sources represent direct, uninterpreted records of the subject of your research study.

NOTE : Information about identifying and using primary resources materials, particularly those held in the USC Libraries, can be found in the Libraries Primary Sources Research Guide .

Value of Primary Sources

Primary sources enable you to get as close as possible to understanding the lived experiences of others and discovering what actually happened during an event. However, what constitutes a primary or secondary source depends on the context in which it is being used. For example, David McCullough’s biography of John Adams could be a secondary source for a paper about John Adams, but a primary source for a paper about how various historians have interpreted the life of John Adams. When in doubt, ask a librarian for assistance!

Reviewing primary source material can be of value in improving your overall research paper because they :

• Are original materials,
• Were created from the time period involved,
• Have not been filtered through interpretation or evaluation by others, and
• Represent original thinking or experiences, reporting of a discovery, or the sharing of new information.

Examples of primary documents you could review as part of your overall study include :

• Artifacts [e.g. furniture or clothing, all from the time under study]
• Audio recordings [e.g. radio programs]
• Internet communications on email, listservs, blogs, Twitter, Facebook, and other social media platforms
• Interviews [e.g., oral histories, telephone, e-mail]
• Newspaper articles written at the time
• Original official documents [e.g., birth certificate, will, marriage license, trial transcript]
• Personal correspondence [e.g., letters]
• Photographs
• Proceedings of meetings, conferences and symposia
• Records of organizations, government agencies [e.g. annual report, treaty, constitution, government document]
• Survey Research [e.g., market surveys, public opinion polls]
• Transcripts of radio and television programs
• Video recordings
• Works of art, architecture, literature, and music [e.g., paintings, sculptures, musical scores, buildings, novels, poems]

Bahde, Anne. Using Primary Sources: Hands-On Instructional Exercises . Santa Barbara, CA: Libraries Unlimited, 2014; Brundage, Anthony. Going to the Sources: A Guide to Historical Research and Writing . Malden, MA: Wiley Blackwell, 2013; Daniels, Morgan and Elizabeth Yakel. “Uncovering Impact: The Influence of Archives on Student Learning.” Journal of Academic Librarianship 39 (September 2013): 414-422; Krause, Magia G. “Undergraduates in the Archives: Using an Assessment Rubric to Measure Learning.” The American Archivist 73 (Fall/Winter 2010): 507-534; Rockenbach, Barbara. “Archives, Undergraduates, and Inquiry-Based Learning: Case Studies from Yale University Library.” The American Archivist 74 (Spring/Summer 2011): 297-311; Weiner, Sharon A., Sammie Morris , and Lawrence J. Mykytiuk. "Archival Literacy Competencies for Undergraduate History Majors." The American Archivist 78 (Spring/Summer 2015): 154-180.

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Primary Sources Guide

Understanding research sources.

• Evaluating Primary Sources
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• What are Primary Sources?
• What are Secondary Sources?
• What are Tertiary Sources?

A primary source is a first-hand account from a person or organization who:

• Created an original work
• Participated in new scientific discoveries
• Witnessed an event

Some examples of primary sources include:

• Art and artifacts
• Autobiographies, diaries, and memoirs
• Interviews and oral histories
• Novels and poetry
• Photographs
• Data and surveys

Why are primary sources useful?  Primary sources are useful to:

• Observe and analyze an event from an eyewitness perspective
• Develop your own opinions and explanations
• Learn if you agree or disagree with the authors of secondary/tertiary sources and their conclusions

A secondary source has the following qualities:

• It comments on or analyzes something
• It often summarizes or interprets primary sources
• It's usually written by someone who was not directly involved or an eyewitness

Some examples of secondary sources include:

• Analysis or criticism, such as literary criticism
• Biographies
• Essays and reviews

Why are secondary sources useful? Secondary sources are useful because they:

• Help you consider diverse viewpoints about a topic
• Organize and outline information in an approachable way
• Offer information and analysis from experts

Remember, secondary sources are often based on studying and analyzing primary sources . Another way to think about it? Your research paper is a secondary source because you're analyzing and interpreting other sources.

A tertiary source has the following qualities:

• It lists and compiles information without additional analysis
• It repackages important ideas and information from other primary and secondary sources

Some examples of tertiary sources include:

• Directories of local, state, and national organizations
• Encyclopedias and dictionaries
• Guidebooks and handbooks

Why are tertiary sources useful? Tertiary sources are useful because they help you:

• Gather background information about a topic or concept
• Find a variety of information in one source
• Provide information in a concise and compact way

Examples of Primary Sources vs. Other Sources

• Communications

One area of study at Central Piedmont where primary sources are often used is History . Here are some examples:

• Primary Source = Autobiography :  Narrative of the Life of Frederick Douglass: An American Slave by Frederick Douglass
• Secondary Source = Biography :  Frederick Douglass: Prophet of Freedom by David W. Blight

Another area of study at Central Piedmont where primary sources often come into play is English . Here are some examples:

• Primary Source = Novel :  Love in the Time of Cholera by Gabriel García Márquez
• Secondary Source = Literary Criticism :  Gabriel García Márquez in Retrospect: A Collection Book , edited by Gene H. Bell-Villada

One other area of study at Central Piedmont where primary sources often come into play is Communications . Here are some examples:

• Primary Sources = Memoir :  Deaf Utopia: A Memoir--And a Love Letter to a Way of Life  by Nyle DiMarco
• Secondary Sources = Journal Article : "Curriculum and Instruction for Deaf and Hard of Hearing Students: Evidence from the Past—Considerations for the Future" (2023) by Maria C. Hartman, Elaine R. Smolen, and Brynne Powell
• Tertiary Sources = Reference Book :  American Sign Language: A Step-by-Step Guide to Signing by Suzie Chafin

Credit : Austin Community College's Primary Sources guide served as the inspiration and model for this LibGuide.

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Methodology

• Primary Research | Definition, Types, & Examples

Primary Research | Definition, Types, & Examples

Published on January 14, 2023 by Tegan George . Revised on January 12, 2024.

Primary research is a research method that relies on direct data collection , rather than relying on data that’s already been collected by someone else. In other words, primary research is any type of research that you undertake yourself, firsthand, while using data that has already been collected is called secondary research .

Primary research is often used in qualitative research , particularly in survey methodology, questionnaires, focus groups, and various types of interviews . While quantitative primary research does exist, it’s not as common.

Table of contents

When to use primary research, types of primary research, examples of primary research, advantages and disadvantages of primary research, other interesting articles, frequently asked questions.

Primary research is any research that you conduct yourself. It can be as simple as a 2-question survey, or as in-depth as a years-long longitudinal study . The only key is that data must be collected firsthand by you.

Primary research is often used to supplement or strengthen existing secondary research. It is usually exploratory in nature, concerned with examining a research question where no preexisting knowledge exists. It is also sometimes called original research for this reason.

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Primary research can take many forms, but the most common types are:

• Surveys and questionnaires
• Observational studies
• Interviews and focus groups

Surveys and questionnaires collect information about a group of people by asking them questions and analyzing the results. They are a solid choice if your research topic seeks to investigate something about the characteristics, preferences, opinions, or beliefs of a group of people.

Surveys and questionnaires can take place online, in person, or through the mail. It is best to have a combination of open-ended and closed-ended questions, and how the questions are phrased matters. Be sure to avoid leading questions, and ask any related questions in groups, starting with the most basic ones first.

Observational studies are an easy and popular way to answer a research question based purely on what you, the researcher, observes. If there are practical or ethical concerns that prevent you from conducting a traditional experiment , observational studies are often a good stopgap.

There are three types of observational studies: cross-sectional studies , cohort studies, and case-control studies. If you decide to conduct observational research, you can choose the one that’s best for you. All three are quite straightforward and easy to design—just beware of confounding variables and observer bias creeping into your analysis.

Similarly to surveys and questionnaires, interviews and focus groups also rely on asking questions to collect information about a group of people. However, how this is done is slightly different. Instead of sending your questions out into the world, interviews and focus groups involve two or more people—one of whom is you, the interviewer, who asks the questions.

There are 3 main types of interviews:

• Structured interviews ask predetermined questions in a predetermined order.
• Unstructured interviews are more flexible and free-flowing, proceeding based on the interviewee’s previous answers.
• Semi-structured interviews fall in between, asking a mix of predetermined questions and off-the-cuff questions.

While interviews are a rich source of information, they can also be deceptively challenging to do well. Be careful of interviewer bias creeping into your process. This is best mitigated by avoiding double-barreled questions and paying close attention to your tone and delivery while asking questions.

Alternatively, a focus group is a group interview, led by a moderator. Focus groups can provide more nuanced interactions than individual interviews, but their small sample size means that external validity is low.

Primary research can often be quite simple to pursue yourself. Here are a few examples of different research methods you can use to explore different topics.

Primary research is a great choice for many research projects, but it has distinct advantages and disadvantages.

Advantages of primary research

Advantages include:

• The ability to conduct really tailored, thorough research, down to the “nitty-gritty” of your topic . You decide what you want to study or observe and how to go about doing that.
• You maintain control over the quality of the data collected, and can ensure firsthand that it is objective, reliable , and valid .
• The ensuing results are yours, for you to disseminate as you see fit. You maintain proprietary control over what you find out, allowing you to share your findings with like-minded individuals or those conducting related research that interests you for replication or discussion purposes.

Disadvantages of primary research

Disadvantages include:

• In order to be done well, primary research can be very expensive and time consuming. If you are constrained in terms of time or funding, it can be very difficult to conduct your own high-quality primary research.
• Primary research is often insufficient as a standalone research method, requiring secondary research to bolster it.
• Primary research can be prone to various types of research bias . Bias can manifest on the part of the researcher as observer bias , Pygmalion effect , or demand characteristics . It can occur on the part of participants as a Hawthorne effect or social desirability bias .

If you want to know more about statistics , methodology , or research bias , make sure to check out some of our other articles with explanations and examples.

• Chi square goodness of fit test
• Degrees of freedom
• Null hypothesis
• Discourse analysis
• Control groups
• Mixed methods research
• Non-probability sampling
• Quantitative research
• Inclusion and exclusion criteria

Research bias

• Rosenthal effect
• Implicit bias
• Cognitive bias
• Selection bias
• Negativity bias
• Status quo bias

The 3 main types of primary research are:

Exploratory research aims to explore the main aspects of an under-researched problem, while explanatory research aims to explain the causes and consequences of a well-defined problem.

There are several methods you can use to decrease the impact of confounding variables on your research: restriction, matching, statistical control and randomization.

In restriction , you restrict your sample by only including certain subjects that have the same values of potential confounding variables.

In matching , you match each of the subjects in your treatment group with a counterpart in the comparison group. The matched subjects have the same values on any potential confounding variables, and only differ in the independent variable .

In statistical control , you include potential confounders as variables in your regression .

In randomization , you randomly assign the treatment (or independent variable) in your study to a sufficiently large number of subjects, which allows you to control for all potential confounding variables.

A questionnaire is a data collection tool or instrument, while a survey is an overarching research method that involves collecting and analyzing data from people using questionnaires.

When conducting research, collecting original data has significant advantages:

• You can tailor data collection to your specific research aims (e.g. understanding the needs of your consumers or user testing your website)
• You can control and standardize the process for high reliability and validity (e.g. choosing appropriate measurements and sampling methods )

However, there are also some drawbacks: data collection can be time-consuming, labor-intensive and expensive. In some cases, it’s more efficient to use secondary data that has already been collected by someone else, but the data might be less reliable.

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Primary Sources: What They Are and Where to Find Them

What is a primary source.

• Finding Primary Sources in the UWRF Library

A primary source is an original object or document created during the time under study.   Primary sources vary by discipline and can include historical and legal documents, diaries, letters, family records, speeches, interviews, autobiographies, film, government documents, eye witness accounts, results of an experiment, statistical data, pieces of creative writing, and art objects. In the natural and social sciences, the results of an experiment or study are typically found in scholarly articles or papers delivered at conferences, so those articles and papers that present the original results are considered primary sources.  

A secondary source is something written about a primary source. Secondary sources include comments on, interpretations of, or discussions about the original material. You can think of secondary sources as second-hand information. If I tell you something, I am the primary source. If you tell someone else what I told you, you are the secondard source. Secondary source materials can be articles in newspapers or popular magazines, book or movie reviews, or articles found in scholarly journals that evaluate or criticize someone else's original research.

Research versus Review

Scientific and other peer reviewed journals are excellent sources for primary research sources. However, not every article in those journals will be an article with original research. Some will include book reviews and other materials that are more obviously secondary sources . More difficult to differentiate from original research articles are review articles . Both types of articles will end with a list of References (or Works Cited). Review articles are often as lengthy or even longer that original research articles. What the authors of review articles are doing is analysing and evaluating current research or investigations related to a specific topic, field, or problem. They are not primary sources since they review previously published material. They can be helpful for identifying potentially good primary sources, but they aren't primary themselves. Primary research articles can be identified by a commonly used format. If an article contains the following elements, you can count on it being a primary research article. Look for sections entitled Methods (sometimes with variations, such as Materials and Methods), Results (usually followed with charts and statistical tables), and Discussion . You can also read the abstract to get a good sense of the kind of article that is being presented. If it is a review article instead of a research article, the abstract should make that clear. If there is no abstract at all, that in itself may be a sign that it is not a primary resource. Short research articles, such as those found in Science and similar scientific publications that mix news, editorials, and forums with research reports, may not include any of those elements. In those cases look at the words the authors use, phrases such as "we tested," "we used," and "in our study, we measured" will tell you that the article is reporting on original research.

Primary or Secondary: You Decide

The distinction between types of sources can get tricky, because a secondary source may also be a primary source. DoVeanna Fulton's book on slave narratives, for example, can be looked at as both a secondary and a primary source. The distinction may depend on how you are using the source and the nature of your research. If you are researching slave narratives, the book would be a secondary source because Fulton is commenting on the narratives. If your assignment is to write a book review of Speaking Power , the book becomes a primary source, because you are commenting, evaluating, and discussing DoVeanna Fulton's ideas.

You can't always determine if something is primary or secondary just because of the source it is found in. Articles in newspapers and magazines are usually considered secondary sources. However, if a story in a newspaper about the Iraq war is an eyewitness account, that would be a primary source. If the reporter, however, includes additional materials he or she has gathered through interviews or other investigations, the article would be a secondary source. An interview in the Rolling Stone with Chris Robinson of the Black Crowes would be a primary source, but a review of the latest Black Crowes album would be a secondary source. In contrast, scholarly journals include research articles with primary materials, but they also have review articles that are not, or in some disciplines include articles where scholars are looking at primary source materials and coming to new conclusions.

For your thinking and not just to confuse you even further, some experts include tertiary sources as an additional distinction to make. These are sources that compile or, especially, digest other sources. Some reference materials and textbooks are considered tertiary sources when their chief purpose is to list or briefly summarize or, from an even further removed distance, repackage ideas. This is the reason that you may be advised not to include an encyclopedia article in a final bibliography.

The above material was adapted from the excellent explanation written by John Henderson found on Ithaca College's library website http://www.ithacalibrary.com/sp/subjects/primary and is used with permission.

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What Is a Primary Source?

Glossary of Grammatical and Rhetorical Terms - Definition and Examples

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• An Introduction to Punctuation
• Ph.D., Rhetoric and English, University of Georgia
• M.A., Modern English and American Literature, University of Leicester
• B.A., English, State University of New York

In research and academics, a primary source refers to information collected from sources that witnessed or experienced an event firsthand. These can be historical documents , literary texts, artistic works, experiments, journal entries, surveys, and interviews. A primary source, which is very different from a secondary source , is also called primary data.

The Library of Congress defines primary sources as "the raw materials of history—original documents and objects which were created at the time under study," in contrast to secondary sources , which are "accounts or interpretations of events created by someone without firsthand experience," ("Using Primary Sources").

Secondary sources are often meant to describe or analyze a primary source and do not give firsthand accounts; primary sources tend to provide more accurate depictions of history but are much harder to come by.

Characteristics of Primary Sources

There are a couple of factors that can qualify an artifact as a primary source. The chief characteristics of a primary source, according to Natalie Sproull, are: "(1) [B]eing present during the experience, event or time and (2) consequently being close in time with the data. This does not mean that data from primary sources are always the best data."

Sproull then goes on to remind readers that primary sources are not always more reliable than secondary sources. "Data from human sources are subject to many types of distortion because of such factors as selective recall, selective perceptions, and purposeful or nonpurposeful omission or addition of information. Thus data from primary sources are not necessarily accurate data even though they come from firsthand sources," (Sproull 1988).

Original Sources

Primary sources are often called original sources, but this is not the most accurate description because you're not always going to be dealing with original copies of primary artifacts. For this reason, "primary sources" and "original sources" should be considered separate. Here's what the authors of "Undertaking Historical Research in Literacy," from Handbook of Reading Research , have to say about this:

"The distinction also needs to be made between primary and original sources . It is by no means always necessary, and all too often it is not possible, to deal only with original sources. Printed copies of original sources, provided they have been undertaken with scrupulous care (such as the published letters of the Founding Fathers), are usually an acceptable substitute for their handwritten originals." (E. J. Monaghan and D. K. Hartman, "Undertaking Historical Research in Literacy," in Handbook of Reading Research , ed. by P. D. Pearson et al. Erlbaum, 2000)

When to Use Primary Sources

Primary sources tend to be most useful toward the beginning of your research into a topic and at the end of a claim as evidence, as Wayne Booth et al. explain in the following passage. "[Primary sources] provide the 'raw data' that you use first to test the working hypothesis and then as evidence to support your claim . In history, for example, primary sources include documents from the period or person you are studying, objects, maps, even clothing; in literature or philosophy, your main primary source is usually the text you are studying, and your data are the words on the page. In such fields, you can rarely write a research paper  without using primary sources," (Booth et al. 2008).

When to Use Secondary Sources

There is certainly a time and place for secondary sources and many situations in which these point to relevant primary sources. Secondary sources are an excellent place to start. Alison Hoagland and Gray Fitzsimmons write: "By identifying basic facts, such as year of construction, secondary sources can point the researcher to the best primary sources , such as the right tax books. In addition, a careful reading of the bibliography in a secondary source can reveal important sources the researcher might otherwise have missed," (Hoagland and Fitzsimmons 2004).

Finding and Accessing Primary Sources

As you might expect, primary sources can prove difficult to find. To find the best ones, take advantage of resources such as libraries and historical societies. "This one is entirely dependent on the assignment given and your local resources; but when included, always emphasize quality. ... Keep in mind that there are many institutions such as the Library of Congress that make primary source material freely available on the Web," (Kitchens 2012).

Methods of Collecting Primary Data

Sometimes in your research, you'll run into the problem of not being able to track down primary sources at all. When this happens, you'll want to know how to collect your own primary data; Dan O'Hair et all tell you how: "If the information you need is unavailable or hasn't yet been gathered, you'll have to gather it yourself. Four basic methods of collecting primary data are field research, content analysis, survey research, and experiments. Other methods of gathering primary data include historical research, analysis of existing statistics, ... and various forms of direct observation," (O'Hair et al. 2001).

• Booth, Wayne C., et al. The Craft of Research . 3rd ed., University of Chicago Press, 2008.
• Hoagland, Alison, and Gray Fitzsimmons. "History."  Recording Historic Structures. 2nd. ed., John Wiley & Sons, 2004.
• Kitchens, Joel D. Librarians, Historians, and New Opportunities for Discourse: A Guide for Clio's Helpers . ABC-CLIO, 2012.
• Monaghan, E. Jennifer, and Douglas K. Hartman. "Undertaking Historical Research in Literacy." Handbook of Reading Research. Lawrence Erlbaum Associates, 2002.
• O'Hair, Dan, et al. Business Communication: A Framework for Success . South-Western College Pub., 2001.
• Sproull, Natalie L. Handbook of Research Methods: A Guide for Practitioners and Students in the Social Sciences. 2nd ed. Scarecrow Press, 1988.
• "Using Primary Sources." Library of Congress .
• Secondary Sources in Research
• Documentation in Reports and Research Papers
• What Is a Research Paper?
• How to Use Libraries and Archives for Research
• How to Cite Genealogy Sources
• Definition and Examples of Quotation in English Grammar
• Fashion Throughout History
• Data Sources For Sociological Research
• 10 Places to Research Your Paper
• Primary and Secondary Sources in History
• How to Develop a Research Paper Timeline
• Research Note Cards
• Abstract Writing for Sociology
• Definition and Examples of Evidence in Argument
• An Introduction to Academic Writing
• Biography of Arturo Alfonso Schomburg, African History Expert

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What is Primary Research and How do I get Started?

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Primary research involves collecting data about a given subject directly from the real world. This section includes information on what primary research is, how to get started, ethics involved with primary research and different types of research you can do. It includes details about interviews, surveys, observations, and analyses.

Primary research is any type of research that you collect yourself. Examples include surveys, interviews, observations, and ethnographic research. A good researcher knows how to use both primary and secondary sources in their writing and to integrate them in a cohesive fashion.

Conducting primary research is a useful skill to acquire as it can greatly supplement your research in secondary sources, such as journals, magazines, or books. You can also use it as the focus of your writing project. Primary research is an excellent skill to learn as it can be useful in a variety of settings including business, personal, and academic.

But I’m not an expert!

With some careful planning, primary research can be done by anyone, even students new to writing at the university level. The information provided on this page will help you get started.

What types of projects or activities benefit from primary research?

When you are working on a local problem that may not have been addressed before and little research is there to back it up.

When you are working on writing about a specific group of people or a specific person.

When you are working on a topic that is relatively new or original and few publications exist on the subject.

You can also use primary research to confirm or dispute national results with local trends.

What types of primary research can be done?

Many types of primary research exist. This guide is designed to provide you with an overview of primary research that is often done in writing classes.

Interviews: Interviews are one-on-one or small group question and answer sessions. Interviews will provide a lot of information from a small number of people and are useful when you want to get an expert or knowledgeable opinion on a subject.

Surveys: Surveys are a form of questioning that is more rigid than interviews and that involve larger groups of people. Surveys will provide a limited amount of information from a large group of people and are useful when you want to learn what a larger population thinks.

Observations: Observations involve taking organized notes about occurrences in the world. Observations provide you insight about specific people, events, or locales and are useful when you want to learn more about an event without the biased viewpoint of an interview.

Analysis: Analysis involves collecting data and organizing it in some fashion based on criteria you develop. They are useful when you want to find some trend or pattern. A type of analysis would be to record commercials on three major television networks and analyze gender roles.

Where do I start?

Consider the following questions when beginning to think about conducting primary research:

• What do I want to discover?
• How do I plan on discovering it? (This is called your research methods or methodology)
• Who am I going to talk to/observe/survey? (These people are called your subjects or participants)
• How am I going to be able to gain access to these groups or individuals?
• What are my biases about this topic?
• How can I make sure my biases are not reflected in my research methods?
• What do I expect to discover?

Primary, Secondary, & Tertiary Sources

• Source Types
• Primary Sources
• Secondary Sources
• Tertiary Sources
• Examples by Discipline

What are primary sources?

Primary sources provide direct or firsthand evidence about a topic. The creator of primary sources is often intimately connected with the topic or event. Most often, creators of primary sources are participants in the events they describe, either directly or by virtue of living during the time period in question. Given this broad definition, primary sources comprise a wide range of resource types across the various disciplines.

What is the role of primary sources in research?

Primary sources are crucial to producing authoritative, original research. They serve as the researcher's primary focus and they represent evidence for a particular phenomenon or theory. As such, primary sources serve as the foundation upon which all secondary and tertiary sources are developed. All research entails primary sources of one kind or another; without primary sources, there would no object of study to analyze, theorize, or critique. 

What are some examples of primary sources?

Primary sources can include many different resource types depending on discipline and application. Primary sources include:

• Historical and legal documents
• Government documents
• Eyewitness accounts
• Results of experiments
• Statistical data
• Pieces of creative writing
• Audio and video recordings
• Photographs
• Correspondence
• Works of art
• Internet communications (email, blogs, and listservs)

In the sciences, primary sources are often empirical studies—research where an experiment was performed or a direct observation was made. The results of empirical studies are typically found in peer-reviewed journal articles or papers delivered at conferences.

In the humanities, on the other hand, primary sources tend to be things like works of art, historical accounts of events, government documents, rare or archival materials, oral histories, or audio/visual materials. These sources provide the humanities researcher evidence upon which they develop their argument. These kinds of primary sources are more likely to be found in museums, libraries, archives, and digitized collections.

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Research Process :: Step by Step

• Introduction
• Select Topic
• Identify Keywords
• Background Information
• Develop Research Questions
• Refine Topic
• Search Strategy
• Popular Databases
• Evaluate Sources
• Types of Periodicals
• Reading Scholarly Articles
• Primary & Secondary Sources
• Organize / Take Notes
• Writing & Grammar Resources
• Annotated Bibliography
• Literature Review
• Citation Styles
• Paraphrasing
• Privacy / Confidentiality
• Research Process
• Selecting Your Topic
• Identifying Keywords
• Gathering Background Info
• Evaluating Sources

PEN America Digital Archive

• PEN America Digital Archive The PEN America Digital Archive captures more than 50 years of cultural programming at the intersection of literature and freedom of expression advocacy. With generous support from the National Endowment for the Humanities and the Andrew W. Mellon Foundation, the digital archive makes available long-inaccessible but valuable public and private programming featuring the world’s foremost writers, intellectuals, and artists in candid and often heated discourse about the most relevant cultural and political issues of our times.

US History -- Primary Sources

• Primary Sources for US History This guide provides links to important, substantial, and freely available collections of primary sources dealing with American history. Each source has been chosen, evaluated, and annotated by librarians.
• Primary Sources for Historical Research This guide explains how to identify primary sources and provides an overview of the different kinds of primary sources.

When evaluating the quality of the information you are using, it is useful to identify if you are using a primary, secondary, or tertiary source . By doing so, you recognize if the author is reporting on his/her own first-hand experiences or relying on the views of others.

Primary Sources : : Defined

Primary sources provide firsthand testimony or direct evidence concerning a topic or question under investigation.  They are usually created by witnesses or recorders who experienced the events or conditions being documented. Often these sources are created at the time when the events or conditions are occurring.

"Primary sources . . . are defined as the direct evidence of a time and place that you are studying – any material (documents, objects, etc.) that was produced by eyewitnesses to or participants in an event or historical moment under investigation. Secondary sources, in contrast, are interpretations – often generated by scholars – that are based upon the examination of multiple primary sources."  (from  Primary Source.org )

Types of Primary Sources

What types of primary sources might have been produced that would be relevant to your topic?

Which persons or organizations might have produced materials?

Possible formats include:

• Photographs, images
• Magazines, newspapers
• Advertisements
• Movies, videos, DVDs
• Memoirs, d iaries, journals
• Audio recordings
• Interviews , l etters , s peeches
• Research data, statistics
• Documents produced by organizations
• Documents produced by government agencies

Find Primary Sources

• Special Collections
• Digital Collections

On the 6th floor of Central Library,  Special Collections  specializes in  (PRINT)  historical materials relating to

• the U.S. War with Mexico (1846-1848)
• the cartographic (maps) history of Texas and the Gulf of Mexico
• Mexico from 1810-1920.

Texas Archival Resources Online (TARO)

(TARO) contains Special Collections' detailed guides. (SEARCH FOR: University of Texas at Arlington Library, Special Collections in drop down menu)

• Archives & Locating Archives Collections Guide on archival field and using archives in the UTA Libraries Special Collections.
• Sabin Americana, 1500-1926 This link opens in a new window This digital collection contains primary works about the Americas published throughout the world from 1500 to the early 1900's. more... less... Sabin Americana, 1500-1926 offers full-text access to more than 29,000 titles about the Americas including accounts of exploration, trade, colonialism, Native Americans, etc. Primary sources include books, pamphlets, serials, broadsides, and other historical documentation that describe the society, politics, religious beliefs, customs, and momentous events that characterized life in the Americas.
• Oral History Online This link opens in a new window Oral History Online is a database of English language oral histories. more... less... Oral History Online contains more than 34,000 pages of full-text content including Ellis Island oral history narratives and rare Black Panther Party interviews. It is also an index to free oral history information on the Web. Indexed oral histories represent information from archives, repositories, and individuals around the world.
• Early Encounters in North America: Peoples, Cultures and the Environment This link opens in a new window This full-text work in progress documents the relationships among peoples in North America from 1534 to 1850 more... less... This full-text work in progress documents the relationships among peoples in North America from 1534 to 1850. It focuses on personal accounts of traders, slaves, missionaries, explorers, soldiers, native peoples, and officials. Source materials include narratives, diaries, journals, and letters.
• Sixties: Primary Documents and Personal Narratives, 1960-1974 This link opens in a new window For scholars and students researching this important period in American history, culture, and politics. more... less... The Sixties: Primary Documents and Personal Narratives 1960-1974 contains diaries, letters, autobiographies and other memoirs, written and oral histories, manifestos, government documents, memorabilia, and scholarly commentary. Spanning 1960 to 1974, The Sixties is centered on key themes that provide insight into the issues that shaped America and that still resonate in today's debates: Arts, Music, and Leisure; Civil Rights; Counter-Culture; Environmental Movement; Gay and Lesbian Rights; Law and Government; Mass Media; New Left and Emerging Neo-Conservative Movement; Science and Technology; Student Activism; Vietnam War; and Women's Movement.
• Gerritsen Collection - Women's History Online 1543-1945 This link opens in a new window A collection of books, pamphlets and periodicals reflecting the evolution of a feminist consciousness and the movement for women's rights more... less... A collection of books, pamphlets and periodicals reflecting the evolution of a feminist consciousness and the movement for women's rights. The collection consists of 265 periodicals and 4471 monographs from continental Europe, the U.S., the United Kingdom, Canada, and New Zealand. The ASCII text is searchable by keyword and Boolean operators, and records are linked to the corresponding full-text page images.
• North American Immigrant Letters, Diaries, and Oral Histories This link opens in a new window This work in progress is composed of the personal narratives of immigrants to North America, including Canada more... less... This work in progress is composed of the personal narratives of immigrants to North America, including Canada. Included are letters, diaries, autobiographies, and oral histories. This database provides perspectives both on North America and on the immigrants' countries of origin.

The New York Times (1851-2007) Offers full-page and article images with search-able full-text back to the first issue.

Dallas Morning News Historical Archive(1885-1984)  Important resource for Texas History.

Chicago Defender (1956-1973) The Chicago Defender has been a leading voice of the black community, with more than two-thirds of its readership outside Chicago. A full-image is provided for the newspaper.

• ProQuest Historical Newspapers: The Wall Street Journal (1889 - 2011) This link opens in a new window A full-image archive that includes the entire historical run of the newspaper from 1889 - 2011. See also The Wall Street Journal archive (1984 - Current) . more... less... ProQuest Historical Newspapers: The Wall Street Journal (1889 - 2002): In 1889, Dow Jones & Company first published The Wall Street Journal (formerly known as the Customers' Afternoon Letter) as a markets-focused newspaper for the country's then-fewer than 200,000 shareholders. Today, it focuses not only on the stock market, but on all aspects of global business, economics, consumer affairs, and trends and issues. Online researchers have access to more than 100 years of The Journal's accurate reporting, exclusive analysis, agenda setting, editorials, and controversial opinions. In addition to the printed stories, researchers also can study the charts, stock tables, graphics, and illustrations featured in the publication. With this resource, users can study the development of industries and companies across decades, monitor the implementation and effects of fiscal policies on the global economy, study opposing viewpoints at critical times in the world's history, and more. This title is especially appealing to those interested in business, finance, economics, and journalism.

Cartographic Connections

Here are some of the maps from Special Collections

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Information For Students

I have to write a research paper using primary sources. where do i start.

• What are Special Collections and Archives?
• What is the difference between Primary and Secondary sources?
• How do I cite primary source materials?

Primary sources are created by individuals who participated in or witnessed an event and recorded that event during or immediately after the event.

Explanation:

A student activist during the war writing about protest activities has created a memoir. This would be a primary source because the information is based on her own involvement in the events she describes. Similarly, an antiwar speech is a primary source. So is the arrest record of student protesters. A newspaper editorial or article, reporting on a student demonstration is also a primary source.

Deeds, wills, court documents, military records, tax records, census records, diaries, journals, letters, account books, advertisements, newspapers, photographs, and maps are primary sources.

Secondary sources are created by someone who was either not present when the event occurred or removed from it in time. We use secondary sources for overview information, and to help familiarize ourselves with a topic and compare that topic with other events in history.

History books, encyclopedias, historical dictionaries, and academic articles are secondary sources.

If you've never written a research paper using primary sources, it is important to understand that the process is different from using only secondary sources. Many students discover that finding and gaining access to primary source documents can be difficult. The Library website has a valuable guide to locating primary source documents. Follow the link below to be redirected to that guide:

https://libguides.furman.edu/resources/primary-sources

• Students are encouraged to seek help from the Special Collections Librarian or Research Librarians to aid in their research projects. Librarians will be able to aid students in a variety of ways including helping to locate primary source materials.

After locating appropriate primary sources, it is necessary for students to analyze and interpret them. To many students, this task can seem arduous, if not overwhelming. There are many resources available in the library as well as online, which are helpful. The National Archives website has very useful analysis worksheets that can help students to determine the significance of primary source documents. Links to PDF files of these worksheets are listed below:

Written Document | Artifact | Cartoon | Map | Motion Picture | Photograph | Poster | Sound Recording

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• Healey Library
• Research Guides

Primary Sources: A Research Guide

• Primary vs. Secondary
• Historical Newspapers
• Book Collections
• Find Videos
• Open Access
• Local Archives and Archival Societies
• University Archives and Special Collections at UMass Boston

Primary Sources

Texts of laws and other original documents.

Newspaper reports, by reporters who witnessed an event or who quote people who did.

Speeches, diaries, letters and interviews - what the people involved said or wrote.

Original research.

Datasets, survey data, such as census or economic statistics.

Photographs, video, or audio that capture an event.

Secondary Sources

Secondary Sources are one step removed from primary sources, though they often quote or otherwise use primary sources. They can cover the same topic, but add a layer of interpretation and analysis. Secondary sources can include:

Most books about a topic.

Analysis or interpretation of data.

Scholarly or other articles about a topic, especially by people not directly involved.

Documentaries (though they often include photos or video portions that can be considered primary sources).

When is a Primary Source a Secondary Source?

Whether something is a primary or secondary source often depends upon the topic and its use.

A biology textbook would be considered a secondary source if in the field of biology, since it describes and interprets the science but makes no original contribution to it.

On the other hand, if the topic is science education and the history of textbooks, textbooks could be used a primary sources to look at how they have changed over time.

Examples of Primary and Secondary Sources

Adapted from Bowling Green State University, Library User Education, Primary vs. Secondary Sources .

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Educator Resources

Finding Primary Sources for Teachers and Students

Finding primary sources.

Primary Sources from DocsTeach Thousands of online primary source documents from the National Archives to bring the past to life as classroom teaching tools.

National Archives Catalog Find online primary source materials for classroom & student projects from the National Archive's online catalog (OPA).

Beginning Research Activities Student activities designed to help you navigate the National Archives resources and web site.

Online Exhibits Exhibits featuring online documents, photos and primary sources from the National Archives

Our Documents 100 Milestone Documents of American History

Getting Started with Research How to start researching records at the National Archives. Finding your topic, identifying records, planning a visit, and more.

Online Research Tools & Aids Introduction to catalogs, databases, and other online resources.

Citing Primary Sources Citing Records in the National Archives of the United States

Philosophy: A Guide to Research

• About this Guide
• Getting Started with Research
• Finding Peer-Reviewed Articles

Primary & Secondary Sources

Tips for finding primary sources, books in milne library's reference collection, databases available through milne library, websites for primary sources.

• Finding a Book at Milne Library
• Citations This link opens in a new window
• Get Library Help
• Self-Guided Tour of the James M. Milne Library
• SUNY Oneonta Philosophy Department This link opens in a new window

Primary sources  are documents or objects that provide direct, first-hand evidence. A secondary source  analyzes, discusses, summarizes, and comments upon primary sources. Secondary sources are one step removed from the original, primary source.

Disciplines define primary sources differently. To the scientist, they might be reports of original research or personal papers; to the journalist, they might be interviews or letters. 

In Philosophy, examples of primary sources can include:

• philosophical texts, treatises, meditations 
• personal narratives, diaries, memoirs, correspondence, letters

( Primary Sources - Philosophy - Subject Guides at University of Alberta Libraries (ualberta.ca)  available under a  Creative Commons — Attribution-NonCommercial-ShareAlike 4.0 International — CC BY-NC-SA 4.0 ) 

Examples of secondary sources include:

• biographies
• critical analysis
• second-person account
• historical study 
• journal article summarizing or examining previous findings

Primary sources may be available in print, in library databases, on websites, or in microform collections. Print primary sources, or print reproductions of primary sources, are sometimes available in archives and libraries.  In addition, primary sources are increasingly found online in digitized form. These may be found in library databases or on websites. Primary sources are also available in m icroform, a format that has been used for many years to preserve documents, as well as to save storage space. 

Tips for finding primary sources:

When searching print and online access tools use search terms such as SOURCES , CORRESPONDENCE , PERSONAL NARRATIVES , DIARIES , RECORDS AND CORRESPONDENCE , SERMONS , SPEECHES , PAPERS , LETTERS.

Look for titles of primary sources in secondary sources and in lists included in bibliographies of secondary sources. Use text, class, and library bibliographies for recommended titles or listings of primary sources.

Browse library shelves around other relevant books. This is often a wonderful way to discover collections of primary sources that have been published in a book format.

On this guide you will find a partial listing of primary source materials available in Milne Library. This includes a listing of reference books , databases , websites , and  microform collections containing primary source materials.  Remember, this is only a partial listing.  More primary sources can be found through searching print and online access tools and browsing the library shelves in relevant areas.

Below is a  partial  listing of books in Milne Library’s Reference Collection that may be helpful for primary source research. Some titles only list sources, whereas others include the text of sources. Note the call number below each title. These items cannot be checked out. However,  students can request free photocopy of pages in print reference sources at the Research Help Desk . Staff members will attempt to make copies at the time of the request, but students should generally expect to pick up photocopies one or two days after the request has been submitted. A scanner is also available in the reference area for copying information. Assistance is available at the Research Help Desk.

Below are some databases that may be helpful for primary source research. Some databases only list sources, whereas others include the full text of sources. All of the following databases are listed on the library website alphabetically by title under the Databases tab .

• American Antiquarian Society (AAS) Historical Periodicals Collection: Series 1 This link opens in a new window Consists of over 850,000 pages including the full-text of almost every seventeenth- and eighteenth-century American title published before 1821. Areas covered include Afro-Americana, children's literature, education, eighteenth-century imprints, leisure and hobbies, medicine, religion, the trades, and women's literature.
• American Antiquarian Society (AAS) Historical Periodicals Collection: Series 2 This link opens in a new window Presents over 1000 full-text titles dating from 1821 through 1837. Areas covered include agriculture, entertainment, history, literary criticism, and politics.
• American Antiquarian Society (AAS) Historical Periodicals Collection: Series 4 This link opens in a new window Provides a diverse record of life leading up to and during the Civil War, from 1853-1865. News from the battlefront can be found in addition to science, literature, medicine, agriculture, women’s fashion, family life, and religion.

• Archives of Latin American & Caribbean History, 16th-20th Century This link opens in a new window Primary source documents about Latin America and the Caribbean. Includes academic journals, reference articles, news-feeds, maps, statistics, audio and video as well as over 1.3 million pages of historical material.
• China: Trade, Politics and Culture 1793-1980 This link opens in a new window English-language sources relating to China and the West, 1793-1980. Manuscripts encompassing events from the earliest English embassy to the birth and early years of the People’s Republic. Sources describing the lives and work of missionaries in China from 1869-1970.
• European Views of the Americas: 1493 to 1750 This link opens in a new window EBSCO Publishing, in cooperation with the John Carter Brown Library, created this resource from "European Americana: A Chronological Guide to Works Printed In Europe Relating to The Americas, 1493-1750". Contains more than 32,000 entries. Index only.
• Harpweek - The Civil War Era: 1857-1865 This link opens in a new window HarpWeek is the full-text, full-image electronic version of Harpers Weekly. Coverage is from 1857-1865.
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• Published: 28 March 2024

New water accounting reveals why the Colorado River no longer reaches the sea

• Brian D. Richter   ORCID: orcid.org/0000-0001-7216-1397 1 , 2 ,
• Gambhir Lamsal   ORCID: orcid.org/0000-0002-2593-8949 3 ,
• Landon Marston   ORCID: orcid.org/0000-0001-9116-1691 3 ,
• Sameer Dhakal   ORCID: orcid.org/0000-0003-4941-1559 3 ,
• Laljeet Singh Sangha   ORCID: orcid.org/0000-0002-0986-1785 4 ,
• Richard R. Rushforth 4 ,
• Dongyang Wei   ORCID: orcid.org/0000-0003-0384-4340 5 ,
• Benjamin L. Ruddell 4 ,
• Kyle Frankel Davis   ORCID: orcid.org/0000-0003-4504-1407 5 , 6 ,
• Astrid Hernandez-Cruz   ORCID: orcid.org/0000-0003-0776-5105 7 ,
• Samuel Sandoval-Solis 8 &
• John C. Schmidt 9  

Communications Earth & Environment volume  5 , Article number:  134 ( 2024 ) Cite this article

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• Water resources

Persistent overuse of water supplies from the Colorado River during recent decades has substantially depleted large storage reservoirs and triggered mandatory cutbacks in water use. The river holds critical importance to more than 40 million people and more than two million hectares of cropland. Therefore, a full accounting of where the river’s water goes en route to its delta is necessary. Detailed knowledge of how and where the river’s water is used can aid design of strategies and plans for bringing water use into balance with available supplies. Here we apply authoritative primary data sources and modeled crop and riparian/wetland evapotranspiration estimates to compile a water budget based on average consumptive water use during 2000–2019. Overall water consumption includes both direct human uses in the municipal, commercial, industrial, and agricultural sectors, as well as indirect water losses to reservoir evaporation and water consumed through riparian/wetland evapotranspiration. Irrigated agriculture is responsible for 74% of direct human uses and 52% of overall water consumption. Water consumed for agriculture amounts to three times all other direct uses combined. Cattle feed crops including alfalfa and other grass hays account for 46% of all direct water consumption.

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Introduction

Barely a trickle of water is left of the iconic Colorado River of the American Southwest as it approaches its outlet in the Gulf of California in Mexico after watering many cities and farms along its 2330-kilometer course. There were a few years in the 1980s in which enormous snowfall in the Rocky Mountains produced a deluge of spring snowmelt runoff capable of escaping full capture for human uses, but for most of the past 60 years the river’s water has been fully consumed before reaching its delta 1 , 2 . In fact, the river was overconsumed (i.e., total annual water consumption exceeding runoff supplies) in 16 of 21 years during 2000–2020 3 , requiring large withdrawals of water stored in Lake Mead and Lake Powell to accommodate the deficits. An average annual overdraft of 10% during this period 2 caused these reservoirs– the two largest in the US – to drop to three-quarters empty by the end of 2022 4 , triggering urgent policy decisions on where to cut consumption.

Despite the river’s importance to more than 40 million people and more than two million hectares (>5 million acres) of cropland—producing most of the vegetable produce for American and Canadian plates in wintertime and also feeding many additional people worldwide via exports—a full sectoral and crop-specific accounting of where all that water goes en route to its delta has never been attempted, until now. Detailed knowledge of how and where the river’s water is used can aid design of strategies and plans for bringing water use into balance with available supplies.

There are interesting historical reasons to explain why this full water budget accounting has not been accomplished previously, beginning a full century ago when the apportionment of rights to use the river’s water within the United States was inscribed into the Colorado River Compact of 1922 5 . That Compact was ambiguous and confusing in its allocation of water inflowing to the Colorado River from the Gila River basin in New Mexico and Arizona 6 , even though it accounts for 24% of the drainage area of the Colorado River Basin (Fig.  1 ). Because of intense disagreements over the rights to the Gila and other tributaries entering the Colorado River downstream of the Grand Canyon, the Compact negotiators decided to leave the allocation of those waters rights to a later time so that the Compact could proceed 6 . Arizona’s formal rights to the Gila and other Arizona tributaries were finally affirmed in a US Supreme Court decision in 1963 that also specified the volumes of Colorado River water allocated to California, Arizona, and Nevada 7 . Because the rights to the Gila’s waters lie outside of the Compact allocations, the Gila has not been included in formal accounting of the Colorado River Basin water budget to date 8 . Additionally, the Compact did not specify how much water Mexico—at the river’s downstream end—should receive. Mexico’s share of the river was not formalized until 22 years later, in the 1944 international treaty on “Utilization of the Waters of the Colorado and Tijuana Rivers and of the Rio Grande” (1944 Water Treaty) 9 . As a result of these political circumstances, full accounting for direct water consumption at the sectoral level—in which water use is accounted according to categories such as municipal, industrial, commercial, or agricultural uses—has not previously been compiled for the Gila River basin’s water, and sectoral accounting for Mexico was not published until 2023 10 .

The physical boundary of the Colorado River Basin is outlined in black. Hatched areas outside of the basin boundary receive Colorado River water via inter-basin transfers (also known as ‘exports’). The Gila River basin is situated in the far southern portion of the CRB in Arizona, New Mexico, and Mexico. Map courtesy of Center for Colorado River Studies, Utah State University.

The US Bureau of Reclamation (“Reclamation”)—which owns and operates massive water infrastructure in the Colorado River Basin—has served as the primary accountant of Colorado River water. In 2012, the agency produced a “Colorado River Basin Water Supply and Demand Study” 8 that accounted for both the sectoral uses of water within the basin’s physical boundaries within the US as well as river water exported outside of the basin (Fig.  1 ). But Reclamation did not attempt to account for water generated from the Gila River basin because of that sub-basin’s exclusion from the Colorado River Compact, and it did not attempt to explain how water crossing the border into Mexico is used. The agency estimated riparian vegetation evapotranspiration for the lower Colorado River but not the remainder of the extensive river system. Richter et al. 11 published a water budget for the Colorado River that included sectoral and crop-specific water consumption but it too did not include water used in Mexico, nor reservoir evaporation or riparian evapotranspiration, and it did not account for water exported outside of the Colorado River Basin’s physical boundary as illustrated in Fig.  1 . Given that nearly one-fifth (19%) of the river’s water is exported from the basin or used in Mexico, and that the Gila is a major tributary to the Colorado, this incomplete accounting has led to inaccuracies and misinterpretations of “where the Colorado River’s water goes” and has created uncertainty in discussions based on the numbers. This paper provides fuller accounting of the fate of all river water during 2000–2019, including averaged annual consumption in each of the sub-basins including exports, consumption in major sectors of the economy, consumption in the production of specific types of crops, and water consumed by reservoir evaporation and riparian/wetland evapotranspiration.

Rising awareness of water overuse and prolonged drought has driven intensifying dialog among the seven US states sharing the basin’s waters as well as between the United States, Mexico, and 30 tribal nations within the US. Since 2000, six legal agreements affecting the US states and two international agreements with Mexico have had the effect of reducing water use from the Colorado River 7 :

In 2001, the US Secretary of the Interior issued a set of “Interim Surplus Guidelines” to reduce California’s water use by 14% to bring the state within its allocation as determined in the 1963 US Supreme Court case mentioned previously. A subsequent “Quantification Settlement Agreement” executed in 2003 spelled out details about how California was going to achieve the targeted reduction.

In 2007, the US Secretary of the Interior adopted a set of “Colorado River Interim Guidelines for Lower Basin Shortages and the Coordinated Operations for Lake Powell and Lake Mead” that reduced water deliveries to Arizona and Nevada when Lake Mead drops to specified levels, with increasing cutbacks as levels decline.

In 2012, the US and Mexican federal governments signed an addendum to the 1944 Water Treaty known as Minute 319 that reduced deliveries to Mexico as Lake Mead elevations fall.

In 2017, the US and Mexican federal governments established a “Binational Water Scarcity Contingency Plan” as part of Minute 323 that provides for deeper cuts in deliveries to Mexico under specified low reservoir elevations in Lake Mead.i

In 2019, the three Lower Basin states and the US Secretary of the Interior agreed to commitments under the “Lower Basin Drought Contingency Plan” that further reduced water deliveries beyond the levels set in 2007 and added specifications for deeper cuts as Lake Mead drops to levels lower than anticipated in the 2007 Guidelines.

In 2023, the states of California, Arizona and Nevada committed to further reductions in water use through the year 2026 12 .

With each of the above agreements, overall water consumption has been reduced but many scientists assert that these reductions still fall substantially short of balancing consumptive use with 21st century water supplies 2 , 13 . With all of these agreements—excepting the Interim Surplus Guidelines of 2001—set to expire in 2026, management of the Colorado River’s binational water supply is now at a crucial point, emphasizing the need for comprehensive water budget accounting.

Our tabulation of the Colorado River’s full water consumption budget (Table  1 ) provides accounting for all direct human uses of water as either agricultural or MCI (municipal, commercial, industrial), as well as indirect losses of water to reservoir evaporation and evapotranspiration from riparian or wetland vegetation including in the Salton Sea and in a wetland in Mexico (Cienega de Santa Clara) that receives agricultural return flows from irrigated areas in Arizona. We explicitly note that all estimates represent consumptive use , resulting from the subtraction of return flows from total water withdrawals. Table  2 provides a summary based only on direct human uses and does not include indirect consumption of water. We have provided Tables  1 and 2 in English units in our Supplementary Information as Tables SI-1 and SI-2 . We have lumped municipal, commercial, and industrial (MCI) uses together because these sub-categories of consumption are not consistently differentiated within official water delivery data for cities utilizing Colorado River water. More detail on urban water use by cities dependent on the river is available in Richter 14 , among other studies.

We differentiated water consumption geographically using the ‘accounting units’ mapped in Fig.  2 , which are based on the Colorado River Basin map as revised by Schmidt 15 ; importantly, these accounting units align spatially with Reclamation’s accounting systems for the Upper Basin and Lower Basin as described in our Methods, thereby enabling readers accustomed to Reclamation’s water-use reports to easily comprehend our accounting. We have also accounted for all water consumed within the Colorado River Basin boundaries as well as water exported via inter-basin transfers. Water exported outside of the basin includes 47 individual inter-basin transfer systems (i.e., canals, pipelines, pumps) that in aggregate export ~12% of the river’s water. We note that the Imperial Irrigation District of southern California is often counted as a recipient of exported water, but we have followed the rationale of Schmidt 15 by including it as an interior part of the Lower Basin even though it receives its Colorado River water via the All American Canal (Fig.  2 ).

The water budget estimates presented in Tables  1 and 2 are summarized for each of the seven “accounting units” displayed here.

These results confirm previous findings that irrigated agriculture is the dominant consumer of Colorado River water. Irrigated agriculture accounts for 52% of overall consumption (Table  1 ; Figs.  3 and 4 ) and 74% of direct human consumption (Table  2 ) of water from the Colorado River Basin. As highlighted in Richter et al. 11 , cattle-feed crops (alfalfa and other hay) are the dominant water-consuming crops dependent upon irrigation water from the basin (Tables  1 and 2 ; Figs.  3 and 4 ). Those crops account for 32% of all water consumed from the basin, 46% of all direct water consumption, and 62% of all agricultural water consumed (Table  1 ; Fig.  3 ). The percentage of water consumed by irrigated crops is greatest in Mexico, where they account for 86% of all direct human uses (Table  2 ) and 80% of total water consumed (Table  1 ). Cattle-feed crops consume 90% of all water used by irrigated agriculture within the Upper Basin, where the consumed volume associated with these cattle-feed crops amounts to more than three times what is consumed for municipal, commercial, or industrial uses combined.

All estimates based on 2000–2019 averages. Both agriculture and MCI (municipal, commercial, and industrial) uses are herein referred to as “direct human uses.” “Indirect uses” include both reservoir evaporation as well as evapotranspiration by riparian/wetland vegetation.

Water consumed by each sector in the Colorado River Basin and sub-basins (including exports), based on 2000–2019 averages.

Another important finding is that a substantial volume of water (19%) is consumed in supporting the natural environment through riparian and wetland vegetation evapotranspiration along river courses. This analysis—made possible because of recent mapping of riparian vegetation in the Colorado River Basin 16 —is an important addition to the water budget of the Colorado River Basin, given that the only previous accounting for riparian vegetation consumption has limited to the mainstem of the Colorado River below Hoover Dam and does not include vegetation upstream of Hoover Dam nor vegetation along tributary rivers 17 . Given that many of these habitats and associated species have been lost or became imperiled due to river flow depletion 18 —including the river’s vast delta ecosystem in Mexico—an ecologically sustainable approach to water management would need to allow more water to remain in the river system to support riparian and aquatic ecosystems. Additionally, 11% of all water consumed in the Colorado River Basin is lost through evaporation from reservoirs.

It is also important to note a fairly high degree of inter-annual variability in each sector of water use; for example, the range of values portrayed for the four water budget sectors shown in Fig.  5 equates to 24–47% of their 20-year averages. Also notable is a decrease in water consumed in the Lower Basin between the years 2000 and 2019 for both the MCI (−38%) and agricultural sectors (−15%), which can in part be attributed to the policy agreements summarized previously that have mandated water-use reductions.

Inter-annual variability of water consumption within the Lower and Upper Basins, including water exported from these basins. The average (AVG) values shown are used in the water budgets detailed in Tables  1 and 2 .

The water accounting in Richter et al. 11 received a great deal of media attention including a front-page story in the New York Times 19 . These stories focused primarily on our conclusion that more than half (53%) of water consumed in the Colorado River Basin was attributable to cattle-feed crops (alfalfa and other hays) supporting beef and dairy production. However, that tabulation of the river’s water budget had notable shortcomings, as discussed previously. In this more complete accounting that includes Colorado River water exported outside of the basin’s physical boundary as well as indirect water consumption, we find that irrigated agriculture consumes half (52%) of all Colorado River Basin water, and the portion of direct consumption going to cattle-feed crops dropped from 53% as reported in Richter et al. 11 to 46% in this revised analysis.

These differences are explained by the fact that we now account for all exported water and also include indirect losses of water to reservoir evaporation and riparian/wetland evapotranspiration in our revised accounting, as well as improvements in our estimation of crop-water consumption. However, the punch line of our 2020 paper does not change fundamentally. Irrigated agriculture is the dominant consumer of water from the Colorado River, and 62% of agricultural water consumption goes to alfalfa and grass hay production.

Richter et al. 20 found that alfalfa and grass hay were the largest water consumers in 57% of all sub-basins across the western US, and their production is increasing in many western regions. Alfalfa is favored for its ability to tolerate variable climate conditions, especially its ability to persist under greatly reduced irrigation during droughts and its ability to recover production quickly after full irrigation is resumed, acting as a “shock absorber” for agricultural production under unpredictable drought conditions. The plant is also valued for fixing nitrogen in soils, reducing fertilizer costs. Perhaps most importantly, labor costs are comparatively low because alfalfa is mechanically harvested. Alfalfa is increasing in demand and price as a feed crop in the growing dairy industry of the region 21 . Any efforts to reduce water consumed by alfalfa—either through shifting to alternative lower-water crops or through compensated fallowing 20 —will need to compete with these attributes.

This new accounting provides a more comprehensive and complete understanding of how the Colorado River Basin’s water is consumed. During our study period of 2000–2019, an estimated average of 23.7 billion cubic meters (19.3 million acre-feet) of water was consumed each year before reaching its now-dry delta in Mexico. Schmidt et al. 2 have estimated that a reduction in consumptive use in the Upper and Lower Basins of 3–4 billion cubic meters (2.4–3.2 million acre-feet) per year—equivalent to 22–29% of direct use in those basins—will be necessary to stabilize reservoir levels, and an additional reduction of 1–3 billion cubic meters (~811,000–2.4 million acre-feet) per year will likely be needed by 2050 as climate warming continues to reduce runoff in the Colorado River Basin.

We hope that this new accounting will add clarity and a useful informational foundation to the public dialog and political negotiations over Colorado River Basin water allocations and cutbacks that are presently underway 2 . Because a persistent drought and intensifying aridification in the region has placed both people and river ecosystems in danger of water shortages in recent decades, knowledge of where the water goes will be essential in the design of policies for bringing the basin into a sustainable water supply-demand balance.

The data sources and analytical approaches used in this study are summarized below. Unless otherwise noted, all data were assembled for each year from 2000–2019 and then averaged. We acknowledge some inconsistency in the manner in which water consumption is measured or estimated across the various data sources and sectors used in this study, as discussed below, and each of these different approaches entail some degree of inaccuracy or uncertainty. We also note that technical measurement or estimation approaches change over time, and new approaches can yield differing results. For instance, the Upper Colorado River Commission is exploring new approaches for estimating crop evapotranspiration in the Upper Basin 22 . When new estimates become available we will update our water budget accordingly.

MCI and agricultural water consumption

The primary source of data on aggregate MCI (municipal, commercial, and industrial) and agricultural water consumption from the Upper and Lower Basins was the US Bureau of Reclamation. Water consumed from the Upper Basin is published in Reclamation’s five-year reports entitled “Colorado River—Upper Basin Consumptive Uses and Losses.” 23 These annual data have been compiled into a single spreadsheet used for this study 24 . Because measurements of agricultural diversions and return flows in the Upper Basin are not sufficiently complete to allow direct calculation of consumptive use, theoretical and indirect methods are used as described in the Consumptive Uses and Losses reports 25 . Reclamation performs these estimates for Colorado, Wyoming, and Utah, but the State of New Mexico provides its own estimates that are collaboratively reviewed with Reclamation staff. The consumptive use of water in thermoelectric power generation in the Upper Basin is provided to Reclamation by the power companies managing each generation facility. Reclamation derives estimates of consumptive use for municipal and industrial purposes from the US Geological Survey’s reporting series (published every 5 years) titled “Estimated Use of Water in the United States” at an 8-digit watershed scale 26 .

Use of shallow alluvial groundwater is included in the water accounting compiled by Reclamation but use of deeper groundwater sources—such as in Mexico and the Gila River Basin—is explicitly excluded in their accounting, and in ours. Reclamation staff involved with water accounting for the Upper and Lower Basins assume that groundwater use counted in their data reports is sourced from aquifers that are hydraulically connected to rivers and streams in the CRB (James Prairie, US Bureau of Reclamation, personal communication, 2023); because of this high connectivity, much of the groundwater being consumed is likely being sourced from river capture as discussed in Jasechko et al. 27 and Wiele et al. 28 and is soon recharged during higher river flows.

Water consumed from the Lower Basin (excluding water supplied by the Gila River Basin) is published in Reclamation’s annual reports entitled “Colorado River Accounting and Water Use Report: Arizona, California, and Nevada.” 3 These consumptive use data are based on measured deliveries and return flows for each individual water user. These data are either measured by Reclamation or provided to the agency by individual water users, tribes, states, and federal agencies 29 . When not explicitly stated in Reclamation reports, attribution of water volumes to MCI or agricultural uses was based on information obtained from each water user’s website, information provided directly by the water user, or information on export water use provided in Siddik et al. 30 . Water use by entities using less than 1.23 million cubic meters (1000 acre-feet) per year on average was allocated to MCI and agricultural uses according to the overall MCI-agricultural percentages calculated within each sub-basin indicated in Tables  1 and 2 for users of greater than 1.23 million cubic meters/year.

Disaggregation of water consumption by sector was particularly important and challenging for the Central Arizona Project given that this canal accounts for 21% of all direct water consumption in the Lower Basin. Reclamation accounts for the volumes of annual diversions into the Central Arizona Project canal but the structure serves 1071 water delivery subcontracts. We classified every unique Central Arizona Project subcontract delivery between 2000–2019 by its final water use to derive an estimated split between agricultural and MCI uses. Central Arizona Project subcontract delivery data were obtained from the current and archived versions of the project’s website summaries in addition to being directly obtained from the agency through a public information request. Subcontract deliveries were classified based on the final end use, including long-term and temporary leases of project water. This accounting also includes the storage of water in groundwater basins for later MCI or agricultural use. Additionally, water allocated to Native American agricultural uses that was subsequently leased to cities was classified as an MCI use.

Data for the Gila River basin was obtained from two sources. The Arizona Department of Water Resources has published data for surface water use in five “Active Management Areas” (AMAs) located in the Gila River basin: Prescott AMA, Phoenix AMA, Pinal AMA, Tucson AMA, and Santa Cruz AMA 31 . The water-use data for these AMAs is compiled from annual reports submitted by each water user (contractor) and then reviewed by the Arizona Department of Water Resources. The AMA water-use data are categorized by purpose of use, facilitating our separation into MCI and agricultural uses. These data are additionally categorized by water source; only surface water sourced from the Gila River hydrologic system was counted (deep groundwater use was not). The AMA data were supplemented with data for the upper Gila River basin provided by the University of Arizona 32 . We have assumed that all water supplied by the Gila River Basin is fully consumed, as the river is almost always completely dry in its lower reaches (less than 1% flows out of the basin into the Colorado River, on average 33 ).

Data for Mexico were obtained from Hernandez-Cruz et al. 10 based on estimates for 2008–2015. Agricultural demands were estimated from annual reports of irrigated area and water use published by the Ministry of Agriculture and the evapotranspiration estimates of the principal crops published by the National Institute for Forestry, Animal Husbandry, and Agricultural Research of Mexico 10 . The average annual volume of Colorado River water consumption in Mexico estimated by these researchers is within 1% of the cross-border delivery volume estimated by the Bureau of Reclamation for 2000–2019 in its Colorado River Accounting and Water Use Reports 3 .

Exported water consumption

Annual average inter-basin transfer volumes for each of 46 canals and pipelines exporting water outside of the Upper Basin were obtained from Reclamation’s Consumptive Uses and Losses spreadsheet 34 . Data for the Colorado River Aqueduct in the Lower Basin were obtained from Siddik et al. 30 Data for exported water in Mexico was available from Hernandez-Cruz et al. 10 . We assigned any seepage or evaporation losses from inter-basin transfers to their proportional end uses. All uses of exported water are considered to be consumptive uses with respect to the Colorado River, because none of the water exported out of the basin is returned to the Colorado River Basin.

We relied on data from Siddik et al. (2023) to identify whether the water exported out of the Colorado River Basin was for only MCI or agricultural use. When more than one water use purpose was identified, as well as for all major inter-basin transfers, we used government and inter-basin transfer project websites or information obtained directly from the project operator or water manager to determine the volume of water transferred and the end uses. Major recipients of exported water include the Coachella Valley Water District (California); Metropolitan Water District of Southern California (particularly for San Diego County, California); Northern Colorado Water Conservancy District; City of Denver (Colorado); the Central Utah Project; City of Albuquerque (New Mexico); and the Middle Rio Grande Conservancy District (New Mexico). We did not pursue sectoral water-use information for 17 of the 46 Upper Basin inter-basin transfers due to their relatively low volumes of water transferred by each system (<247,000 cubic meters or 2000 acre-feet), and instead assigned the average MCI or agricultural percentage (72% MCI, 28% agricultural) from all other inter-basin transfers in the Upper Basin. The export volume of these 17 inter-basin transfers sums to 9.76 million cubic meters (7910 acre-feet) per year, equivalent to 1% of the total volume exported from the Upper Basin.

Reservoir evaporation

Evaporation estimates for the Upper Basin and Lower Basin are based upon Reclamation’s HydroData repository 35 . Reclamation’s evaporation estimates are based on the standardized Penman-Monteith equation as described in the “Lower Colorado River Annual Summaries of Evapotranspiration and Evaporation” reports 17 . The Penman-Monteith estimates are based on pan evaporation measurements. Evaporation estimates for the Salt River Project reservoirs in the Gila River basin were provided by the Salt River Project in Arizona (Charlie Ester, personal communication, 2023).

Another consideration with reservoirs is the volume of water that seeps into the banks or sediments surrounding the reservoir when reservoir levels are high, but then drains back into the reservoir as water levels decline 36 . This has the effect of either exacerbating reservoir losses (consumptive use) or offsetting evaporation when bank seepage flows back into a reservoir. The flow of water into and out of reservoir banks is non-trivial; during 1999–2008, an estimated 247 million cubic meters (200,000 acre-feet) of water drained from the canyon walls surrounding Lake Powell into the reservoir each year, providing additional water supply 36 . However, the annual rate of alternating gains or losses has not been sufficiently measured at any of the basin’s reservoirs and therefore is not included in Tables  1 and 2 .

Riparian and wetland vegetation evapotranspiration

We exported the total annual evapotranspiration depth at a 30 meter resolution from OpenET 37 using Google Earth Engine from 2016 to 2019 to align with OpenET’s data availability starting in 2016. Total annual precipitation depths, sourced from gridMET 38 , were resampled to align with the evapotranspiration raster resolution. Subsequently, a conservative estimate of the annual water depth utilized by riparian vegetation from the river was derived by subtracting the annual precipitation raster from the evapotranspiration raster for each year. Positive differentials, indicative of river-derived evapotranspiration, were then multiplied by the riparian vegetation area as identified in the CO-RIP 16 dataset to estimate the total annual volumetric water consumption by riparian vegetation across the Upper, Lower, and Gila River Basins. The annual volumetric water consumption calculated over four years were finally averaged to get riparian vegetation evapotranspiration in the three basins. Because the entire flow of the Colorado River is diverted into the Canal Alimentador Central near the international border, very little riparian evapotranspiration occurs along the river south of the international border in the Mexico basin.

In addition to water consumed by riparian evapotranspiration within the Lower Basin, the Salton Sea receives agricultural drain water from both the Imperial Irrigation District and the Coachella Valley Irrigation District, stormwater drainage from the Coachella Valley, and inflows from the New and Alamo Rivers 39 . Combined inflows to the Sea during 2015–2019 were added to our estimates of riparian/wetland evapotranspiration in the Lower Basin.

Similarly, Mexico receives drainage water from the Wellton–Mohawk bypass drain originating in southern Arizona that empties into the Cienega de Santa Clara (a wetland); this drainage water is included as riparian/wetland evapotranspiration in the Mexico basin.

Crop-specific water consumption

The volumes of total agricultural consumption reported for each sub-basin in Tables  1 and 2 were obtained from the same data sources described above for MCI consumption and exported water. The portion (%) of those agricultural consumption volumes going to each individual crop was then allocated according to percentage estimates of each crop’s water consumption in each accounting unit using methods described in Richter et al. 20 and detailed here.

Monthly crop water requirements during 1981–2019 for 13 individual crops, representing 68.8% of total irrigated area in the US in 2019, were estimated using the AquaCrop-OS model (Table SI- 3 ) 40 . For 17 additional crops representing about 25.4% of the total irrigated area, we used a simple crop growth model following Marston et al. 41 as crop parameters needed to run AquaCrop-OS were not available. A list of the crops included in this study is shown in Table SI- 3 . The crop water requirements used in Richter et al. 11 were based on a simplistic crop growth model, often using seasonal crop coefficients whereas we use AquaCrop-OS 40 , a robust crop growth model, to produce more realistic crop growth and crop water estimates for major crops. AquaCrop-OS is an open-source version of the AquaCrop model 42 , a crop growth model capable of simulating herbaceous crops. Additionally, we leverage detailed local data unique to the US, including planting dates and subcounty irrigated crop areas, to produce estimates at a finer spatial resolution than the previous study. We obtained crop-specific planting dates from USDA 43 progress data at the state level. For crops that did not have USDA crop progress data, we used data from FAO 44 and CUP+ model 45 for planting dates. We used climate data (precipitation, minimum and maximum air temperature, reference ET) from gridMET 38 , soil texture data from ISRIC 46 database and crop parameters from AquaCrop-OS to run the model. The modeled crop water requirement was partitioned into blue and green components following the framework from Hoekestra et al. 47 , assuming that blue and green water consumed on a given day is proportional to the amount of green and blue water soil moisture available on that day. When applying a simple crop growth model, daily gridded (2.5 arc minutes) crop-specific evapotranspiration (ETc) was computed by taking the product of reference evapotranspiration (ETo) and crop coefficient (Kc), where ETo was obtained from gridMET. Crop coefficients were calculated using planting dates and crop coefficient curves from FAO and CUP+ model. Kc was set to zero outside of the growing season. We partitioned the daily ETc into blue and green components by following the methods from ref. 41 It is assumed that the crop water demands are met by irrigation whenever it exceeds effective precipitation (the latter calculated using the USDA Soil Conservation Service method (USDA, 1968 48 ). We obtained county level harvested area from USDA 43 and disaggregated to sub-county level using Cropland Data Layer (CDL) 49 and Landsat-based National Irrigation Dataset (LANID) 50 . The CDL is an annual raster layer that provides crop-specific land cover data, while the LANID provides irrigation status information. The CDL and LANID raster were multiplied and aggregated to 2.5 arc minutes to match the AquaCrop-OS output. We produced a gridded crop area map by using this resulting product as weights to disaggregate county level area. CDL is unavailable before 2008. Therefore, we used land use data from ref. 51 in combination with average CDL map and county level harvested area to produce gridded crop harvested area. We computed volumetric water consumption by multiplying the crop water requirement depth by the corresponding crop harvested area.

Data availability

All data compiled and analyzed in this study are publicly available as cited and linked in our Methods section. Our compilation of these data is also available from Hydroshare at: http://www.hydroshare.org/resource/2098ae29ae704d9aacfd08e030690392 .

Code availability

All model code and software used in this study have been accessed from sources cited in our Methods section. We used AquaCrop-OS (v5.0a), an open source version of AquaCrop crop growth model, to run crop simulations. This model is publicly available at http://www.aquacropos.com/ . For estimating riparian evapotranspiration, we used ArcGIS Pro 3.1.3 on the Google Earth Engine. Riparian vegetation distribution maps were sourced from Dryad at https://doi.org/10.5061/dryad.3g55sv8 .

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Acknowledgements

This paper is dedicated to our colleague Jack Schmidt in recognition of his retirement and enormous contributions to the science and management of the Colorado River. The authors thank James Prairie of the US Bureau of Reclamation, Luke Shawcross of the Northern Colorado Water Conservancy District, Charlie Ester of the Salt River Project, and Brian Woodward of the University of California Cooperative Extension for their assistance in accessing data used in this study. The authors also thank Rhett Larson at the Sandra Day O’Connor School of Law at Arizona State University for their review of Arizona water budget data, and the Central Arizona Project for providing delivery data by each subcontract. G.L., L.M., and K.F.D. acknowledge support by the United States Department of Agriculture National Institute of Food and Agriculture grant 2022-67019-37180. L.T.M. acknowledges the support the National Science Foundation grant CBET-2144169 and the Foundation for Food and Agriculture Research Grant No. FF-NIA19-0000000084. R.R.R. acknowledges the support the National Science Foundation grant CBET-2115169.

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Contributions

B.D.R. designed the study, compiled and analyzed data, wrote the manuscript and supervised co-author contributions. G.L. compiled all crop data, estimated crop evapotranspiration, and prepared figures. S.D. compiled all riparian vegetation data and estimated riparian evapotranspiration. L.S.S. and R.R.R. accessed, compiled, and analyzed data from the Central Arizona Project. D.W. compiled data and prepared figures. A.H.-C. and S.S.-S. compiled and analyzed data for Mexico. J.C.S. compiled and analyzed reservoir evaporation data and edited the manuscript. L.M., B.L.R., and K.F.D. supervised data compilation and analysis and edited the manuscript.

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Richter, B.D., Lamsal, G., Marston, L. et al. New water accounting reveals why the Colorado River no longer reaches the sea. Commun Earth Environ 5 , 134 (2024). https://doi.org/10.1038/s43247-024-01291-0

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Abstract: The use of Electronic Health Records (EHRs) has increased dramatically in the past 15 years, as, it is considered an important source of managing data od patients. The EHRs are primary sources of disease diagnosis and demographic data of patients worldwide. Therefore, the data can be utilized for secondary tasks such as research. This paper aims to make such data usable for research activities such as monitoring disease statistics for a specific population. As a result, the researchers can detect the disease causes for the behavior and lifestyle of the target group. One of the limitations of EHRs systems is that the data is not available in the standard format but in various forms. Therefore, it is required to first convert the names of the diseases and demographics data into one standardized form to make it usable for research activities. There is a large amount of EHRs available, and solving the standardizing issues requires some optimized techniques. We used a first-hand EHR dataset extracted from EHR systems. Our application uploads the dataset from the EHRs and converts it to the ICD-10 coding system to solve the standardization problem. So, we first apply the steps of pre-processing, annotation, and transforming the data to convert it into the standard form. The data pre-processing is applied to normalize demographic formats. In the annotation step, a machine learning model is used to recognize the diseases from the text. Furthermore, the transforming step converts the disease name to the ICD-10 coding format. The model was evaluated manually by comparing its performance in terms of disease recognition with an available dictionary-based system (MetaMap). The accuracy of the proposed machine learning model is 81%, that outperformed MetaMap accuracy of 67%. This paper contributed to system modelling for EHR data extraction to support research activities.

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Research team creates a chemistry map for human cells

by National Physical Laboratory

Scientists at NPL worked with Diamond Light Source to publish a study that shows how the chemistry of human cells changes, depending on the structure of their extracellular niche, are major determinants of cell responses and development pathways. The paper is published in ACS Applied Materials & Interfaces .

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Scientists at NPL set out to address this gap by recording InfraRed maps of human primary and stem cells grown on native and synthetic matrices.

InfraRed spectroscopy can access virtually all chemical information available in the cell but cannot tell the cell from its matrix or recognize different parts of the same cell. Therefore, a correlative approach involving the use of physical imaging, provided by light and atomic force microscopy , to guide chemical spectra was necessary.

To achieve this, NPL collaborated with beamline scientists at Diamond Light Source, biologists from Sheffield and London Colleges and data expertise from Cambridge. Together, they developed a spectral imaging approach which not only allowed them to obtain chemical maps of single cells but also to cross-compare their chemistry signatures in response to matrices exhibiting distinct physical properties.

Their study also demonstrates the efficiency of correlative measurements to explain cell behavior at cell-matrix interfaces in 2D, as well as the need to develop analogous and more advanced methodologies to measure cell-matrix interfaces in 3D, pathing a way to impact for health care and solutions towards human tissue regeneration.

Max Ryadnov, NPL Fellow, said, "The study was an exciting collaboration which provided us with important insights into how the chemical make-up of human cells correlates with the physical changes of the molecular scaffolds that support their growth and development. The study also informed next steps in our developments focusing on correlative measurements of living biological systems."

Journal information: ACS Applied Materials and Interfaces

Provided by National Physical Laboratory

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