Manuscripts of essays and course notes taken while a student at Amherst College, 1884-1889, and at Berlin University, 1892-1894. Articles, addresses, essays, lectures, lecture notes and reading notes. Also included are diaries for the years 1936-1940 and correspondence concerning Amherst College, Columbia University, and Woodbridge's stay as a visiting scholar in Berlin, 1931-1932. Among his correspondents are: Frederick S. Allis, Secretary of the Amherst Board of Trustees; Stanley King, President of Amherst; and Nicholas Murray Butler, President of Columbia. Some photographs are also included.

Correspondence, manuscripts, notes, notebooks, documents, photographs, course-related materials, and printed materials. The manuscripts include typescripts of Sykes' published and unpublished novels, monographs, plays, short stories, and articles. Among these are The Perennial Avant Garde, The Cool Millennium, and The Hidden Remnant. Sykes' notes and notebooks span the period from the early 1930s to 1980, and include preliminary ideas and sketches for his books, as well as autobiographical material. A small number of documents concern Sykes' wartime work in the U.S. Government Office of War Information. Course-related material including writings and correspondence of students taught by Sykes between 1962 and 1975 at the New School and as an adjunct professor at Columbia University. Printed materials consist of numerous reviews of Sykes' books, in addition to offprints and articles by Sykes. Included as well are printed materials about or connected with Sykes, offprints of articles inscribed to him, and many volumes from his library. The substantial correspondence series includes personal letters and correspondence with agents and publishers relating to his books. Correspondents include Harold Clurman, Aaron Copland, Lawrence Durrell, Georgia O'Keeffe, and Francis Steegmuller, as well as a number of Sykes' students. There is extensive correspondence between Sykes and the artist John Hartell from 1927 to 1983.

Correspondence, manuscripts, notes, documents, subject files, photographs, art works, and printed materials. This collection covers the entire span of his life, although by far the greatest part relates to his activities as a professor from the 1930s to the 1960s. Among the correspondents are many important figures in American Russian studies or Columbia University; there are also many letters from his wife, Clemens T. Robinson, and Lewis Mumford. Manuscripts by Robinson include his "Rural Russia under the Old Regime" lectures, notes, speeches and essays, and also miscellaneous pieces (essays, reviews, poems, stories, plays, etc.) that he wrote while he was an aspiring young journalist and writer in the 1910s and 1920s. Manuscripts by others consist of student theses, papers, books and reports that were given him for review or comment. Subject files deal with such topics as his service in World War I; Columbia University (especially the Libraries and the History Department); and various aspects of academic life and Russian studies. Almost nothing in the collection has any bearing on his government service during World War II; items from the war years concern personal affairs or scholarship. There are photographs of Robinson and his wife; family photographs from the late 19th and early 20th centuries; and Russian scenes. Art works include items by Clemens T. Robinson. Among the printed materials are two books inscribed by Mumford to Robinson.

Correspondence, manuscripts, and notes. This collection contains the manuscripts for most of his books and articles. There are also copies of his many book reviews and articles by other authors analyzing the impact of his interpretations of American history. The correspondents include: H.S. Commager, C. Vann Woodward, Stuart Bruchey, S.E. Morison, Clarence Ver Steeg, Alfred A. Knopf, Helen Frankenthaler, Arthur Schlesinger, Jr., and others. There are also 70 books from his library

Correspondence, manuscripts, subject files and research notes of Sigmund Diamond. Included among the correspondence are Diamond's letters to and from various distinguished members of Columbia University and other academic insitutions, as well as correspondence with many noted sociologists and historians. Included in the manuscripts is Diamond's "In Quest." The subject files comprise material from Diamond's tenure at Columbia and include some material pertaining to his forced departure from Harvard in the 1950's due to his previous communist affiliation, and his active role in maintaining the efficacy of the Freedom of Information Act. The research files include microfilms and notes.