Correspondence, 1904-1946; photographs, juvenilia, and printed material. Correspondence includes that of Anna Hyatt Huntington, Audella Hyatt, Leon Kroll, Alfred G. Mayor, and Harriet Randolph Hyatt Mayor.

Correspondence, 1863-1897; personal documents, manuscripts, and published material of the American physicist.

Correspondence, diary, expedition journal, financial material, scientific notebook and sketches, photographs, published material, including articles and newspaper clippings, and scrapbooks. Correspondence (1854-1902) includes that of Alexander Agassiz, Charles E. Beecher, E.D. Cope, James D. Dana, J.S. Diller, G.K. Gilbert, G. Brown Goode, Asa Gray, Robert T. Hill, Anna Hyatt Huntington, Hyatt’s father, Alpheus Hyatt, Audella Beebe Hyatt, Jules Marcou, Harriet Randolph Hyatt Mayor, A.S. Packard, Charles Schuchert, and Charles Walcott.

Papers of the American sculptor, painter, interior decorator, poet, author. Collection includes correspondence, artwork (sketches, watercolors), exhibition catalogs, photographs, writings, and memorabilia, including financial material.

Papers of the American sculptor, specializing in equestrian figures and animals. Correspondence, 1887-1965; diaries, 1925-1958; articles; exhibition catalogs; financial and legal material; manuscripts; and photographs.

Correspondence, incoming and outgoing (1856-1967); legal and financial records; memorabilia, including address books, clippings, genealogical records, and photographs; and writings, mostly of Roger Burlingame, including manuscript and/or published articles, books, book reviews, diaries, poems, short stories, and speeches. Family members represented include Anson Burlingame (1820-1870), a politician and diplomat; Edward L. Burlingame (1848-1922), author and editor; William Roger Burlingame (1889-1967), author, biographer, and novelist; and his wife, Angeline Whiton (d. 1967), a literary agent, known professionally as Ann Watkins. Notable correspondents include authors, poets, artists, etc.

Correspondence, writings and memorabilia of the American author and Twain biographer.

Papers of the General secretary of the Communist Party of the United States from 1930 through its dissolution in 1944. When the Party was reconstituted as the Communist Political Association later that year, Browder was chosen as its President, however he was expelled in 1946 following a debate over Party leadership. Following his expulsion, Browder lectured and wrote about Marxism and represented Soviet writers and publishers for publication in the United States. Collection includes correspondence/subject files (1879-1970) relating to Marxist philosophy, the workings of the C.P.U.S.A., Browder's role within the Party and to Browder's business ventures as well as legal files (1938-1958); manuscripts (1924-1967) of Browder and others, including Browder's manuscripts for articles, books, memoranda, news releases, pamphlets, reports, and speeches; and memorabilia including personal files and photographs of Browder and his family, and some colleagues. Notable correspondents include Roger Baldwin, Daniel Bell, Bruce Bliven, Rudy Blum, Louis B. Boudin, Juan Antonio Corretjer, Theodore Draper, Elizabeth Gurley Flynn, William Z. Foster, Joseph Freeman, A.A. Heller, Lotte Jacobi, Alfred Kohlberg, Robert S. Minor, Tom Mooney, Paul and Eslanda Goode Robeson, Anna Rochester, Franklin D. Roosevelt, Jack Selford, Joseph R. Starobin, I.F. Stone, John Strachey, Anna Louise Strong, Dirk Jan Struik, Norman Thomas, Harry Frederick Ward, Sumner Welles, and others. Also included is a holograph letter of greeting from Mao Zedong. The collection also includes Browder's personal library and other published materials.

Papers of the American clergyman, educator. Chaffee was a Presbyterian minister in New York City. Correspondence, letters to magazines to which Chaffee contributed, notes, sermons, scrapbooks, diaries, and published material. Sermons (1914-1936) include such topics as religion, specifically Christianity, and its relationship to politics, labor, technocracy, war, pacifism, communism, and socialism.

Personal papers of the missionary, adult educator, and literacy pioneer; also contains organizational records of Laubach Literacy, Inc. Collection includes correspondence, administrative papers, financial papers, U.S. and international projects, writings, photographs, and miscellanea.