Sculptor. Correspondence, lecture notes, speeches, sketches, and blueprints pertaining to Bartlett’s negotiations, contracts, manner of selecting materials, problems and methods of work, and discussions with other sculptors, architects, artists, and craftsmen.

Sculptor and suffragist. Family and general correspondence, diaries, speeches, articles, notes, and other papers concerning Johnson's life and activities as sculptor and feminist. Documents her work on the monument to Susan B. Anthony, Lucretia Mott, and Elizabeth Cady Stanton, now located in the United States Capitol. Also includes records of sittings by Susan B. Anthony, John Burroughs, Ella Wheeler Wilcox, and others of whom she created portrait busts.

Architect and engineer. Principally letters from Latrobe to John Lenthall, clerk of the works of the U.S. Capitol, concerning the construction of the Capitol building in Washington, D.C.

Sculptor. General and family correspondence, sculpture commission files, biographical file, and other papers documenting Lawrie's career as a sculptor whose works were an integral part of public buildings, monuments, and churches throughout the United States.

Army officer, engineer, architect, and scientist. Correspondence, diaries and journals, notebooks, family papers, military papers, drawings and plans, scrapbooks, and other papers relating primarily to Meigs's work in the United States Army Corps of Engineers, his service as quartermaster general during the Civil War, and family matters.

Landscape architectural firm. The records include correspondence, letterbooks, memoranda, reports, plans, specifications, newspaper clippings, photographs, drawings, journals, account books, ledgers, lists, diagrams, blueprints, deeds, and printed matter constituting the business files of the firm and reflecting the breadth of the projects undertaken by its staff. A small group of Olmsted family papers is also contained in the collection.

Landscape architect. Correspondence, letterbooks, journals, drafts of articles and books, speeches and lectures, biographical and genealogical data, business papers, scrapbooks, maps, drawings, and other papers encompassing Olmsted's career and private life. The papers focus on Olmsted's career as a landscape architect, specifically as a designer of parks and the grounds of private estates and public buildings and as a city and regional planner.

United States representative, lawyer, and jurist. Chiefly letters written by Parker while serving in the United States Congress in Washington, D.C. from 1837 to 1839.

Architect and naval officer. Correspondence, writings, publications, reports, and appointment calendars pertaining primarily to Poor's architectural career, particularly his designs for public buildings, and his naval service during World War I and World War II.

Sculptor Vinnie Ream and her husband, army officer and engineer Richard L. Hoxie. Correspondence, memoranda, commissions, essays, poetry by Vinnie Ream and Albert Pike, reports, notebooks, biographical data, scrapbooks, clippings, printed material, and memorabilia pertaining chiefly to Ream's work following her commission to execute the statue of Abraham Lincoln now standing in the United States Capitol rotunda.

Wife of architect William Thornton. Diaries and notebooks primarily describing social life in Washington, D.C., with extensive detail about housekeeping and expense matters. Also contained in the diaries are memorandum books, poems, sketches, and silhouettes of unidentified people.

Architect, inventor, and superintendent of patents. Diaries, architectural drawings, and other papers pertaining to the development of the steamboat, African-American colonization and emigration, the revolt of Spanish colonies in South America, Greek independence, and Thornton's disputes with Benjamin Latrobe over designs for the United States Capitol.

Correspondence, memoranda, notes, and printed materials relating primarily to the signers of the Declaration of Independence.

Typewritten transcripts of oral history interviews conducted by Frank Van der Linden, mostly with members of Congress.