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The Sinclair mss., 1814-1968, consists of the correspondence, writings, and miscellaneous papers of author Upton Beall Sinclair, 1878-1968.

Includes clippings and articles on the Sacco-Vanzetti case, other research materials for Boston, speeches, and interviews with Upton Sinclair.

This collection consists of articles about Upton Sinclair and his works, from various periodicals.

This collection consists of articles written by Upton Sinclair between the years 1940 and 1961, published in various magazines, newspapers, and journals.

This collection consists of articles written by Upton Sinclair between the years 1930 and 1939, published in various magazines, newspapers, and journals.

This collection consists of letters, including letters to the editor and open letters, written by Upton Sinclair and published in various periodicals.

This collection consists of articles written by Upton Sinclair between the years 1905 and 1929, published in various magazines, newspapers, and journals.

This collection consists of book reviews written by Upton Sinclair and published in various magazines, newspapers, and journals.

The Saturday Review of Literature mss., 1946-1956, consists of letters from author Upton Sinclair, 1878-1968, to Norman Cousins, 1915-1990, and Harrison Smith, 1888-1971, editors of the Saturday Review of Literature.

This collection consists of advertisements for Upton Sinclair's works and other ephemera, including theatre programs and tickets for Sinclair's plays.

The Sinclair mss. VI, 1907-1977, consists of correspondence, writings, and miscellaneous papers by and relating to author Upton Beall Sinclair, 1878-1968, his wife Mary Craig (Kimbrough) Sinclair, 1882-1961, and his son David Sinclair, 1901-1987.

The Sinclair mss. VII, 1923-1963, consists of letters and manuscripts by or about writer Upton Beall Sinclair, 1878-1968.

The Sinclair mss. III, 1903-1904, consists of letters from novelist Upton Beall Sinclair, 1878-1968.

The Sinclair mss. V, 1902, consists of the application of novelist Upton Beall Sinclair, 1878-1968, for a fellowship in the Graduate School of Harvard University for the year 1902-1903.

The Singer, D. mss., 1948-1965, consist of letters and notes to, from, and about author Upton Beall Sinclair, 1878-1968, collected by educator Donald Lee Singer, 1936-.

The Sinclair mss. II, 1895-1961, consists of copies of correspondence of and other materials relating to novelist Upton Beall Sinclair, 1878-1968.

The Haldeman mss. II, 1908-1951, consists of correspondence of writers and editors, including Emanuel Haldeman-Julius, 1889-1951, who were connected to Haldeman-Julius Publications.

The Koul mss., 1947-1953, consist of letters of Upton Beall Sinclair, 1878-1968, novelist, to Braj Kishan Koul of Agra, India, translator.

The Kus-Nikolajev mss., 1932-1957, are letters from Upton Beall Sinclair, 1878-1968, novelist, to Mirko Kus-Nikolajev, 1896-?, physician of Zagreb, Yugoslavia.

​The Eeden mss. consists of two reels, 1908-1913 and 1914-1918, of negative microfilm of letters and postcards of Upton Beall Sinclair, 1878-1968, novelist, to Frederik Willem van Eeden, 1860-1932, poet and dramatist, from the originals in the Frederik van Eeden-Genootschap at the University of Amsterdam in Amsterdam, Holland.

The Hapgood mss., 1915-1951, consists of the papers of labor leader Powers Hapgood, 1899-1949.

The Lewisohn mss., 1922-1937, consist of letters from literary men to Ludwig Lewisohn, 1883-1955, author and critic, and personal letters from Lewisohn to his wife, Mrs. Thelma (Spear) Lewisohn, and her mother, Mrs. Elias Spear.

The Ehrmann mss., 1899-1926, consists of letters to Max Ehrmann, 1872-1945, author, from Eugene Victor Debs, Frank Harris and Upton Beall Sinclair, and Mrs. A. Schember.

The Land mss., 1945-1953, consist of letters from Upton Beall Sinclair, 1878-1968, novelist, to translator Rene Land of Groningen, Holland.

The Alex mss., 1910-1935, consists of letters from author Upton Beall Sinclair, 1890-1968, to lawyer and fellow socialist Tanna Alex, 1884-1982.

The Cane mss., 1936-1957, consist of letters from Upton Sinclair, 1878-1968, author, to Melville Henry Cane, 1879-, lawyer and poet. They relate in the main to Sinclair's writings.

The U.S. History mss., 1612-1977, consist of individual items acquired separately either as a gift, purchase, transfer, or removal from a variety of sources, relating to the United States. Additions continue to be made.

The Armour mss., 1952-1956, consists of letters from author Upton Sinclair, 1878-1968, to author and English professor Richard Willard Armour, 1906-1989.

The Clark mss., 1909-1957, consists of the letters and writings of author, editor, and publisher Thomas Curtis Clark, 1877-1953, as well as the autographs and poems of other writers collected by him.

The Bowers mss. II, 1867-1960, consists of the papers of newspaperman and diplomat Claude Gernade Bowers, 1878-1958.

The Baatz mss., 1940-2010, consists of correspondence from prominent literary and political figures to librarian Wilmer Henry Baatz, 1915-1991.

The Boni mss., 1926-1939, consists of the correspondence of author Upton Beall Sinclair, 1878-1968, with publishers Albert Boni, 1892-1981, and Charles Boni, 1894-1969.

The Browne mss., 1878-1949, consists of the papers of Lewis Browne, 1897-1949, author, radio commentator, lecturer, and world traveler.

The Appleton-Century mss., 1846-1962, consists of the office files of the publishing company, its two predecessors, D. Appleton & Co., and the Century Co., and to a small extent its successor, Appleton-Century Crofts, Inc.

The Warren mss., 1910-1948, consists of correspondence from socialist leader Eugene Victor Debs, 1855-1926, to author Fred D. Warren, 1872-1959.

Consists of the correspondence and writings of Max Forrester Eastman, 1883-1969, author.

The Engs, Ruth mss., 2001-2010, consist of typescripts, page proofs, correspondence, and research materials for works by health reform scholar Ruth Engs.

The Greene, E. mss., 1925-1964, consists of the correspondence of Ernest S. Greene, 1890-1979, secretary to novelist Upton Beall Sinclair, 1878-1968.

The Haldeman mss., 1948-1960, consists of files from Haldeman-Julius Publications of Girard, Kansas, containing correspondence with and book sales records of writer Upton Beall Sinclair, 1878-1968.

The Harris, L. mss. consists of materials related to the writing and publication of Upton Sinclair, American Rebel (Crowell, 1975), by author Leon A. Harris, 1926-2000.

The Keller mss., 1938-1953, consists of letters and copies of letters from novelist Upton Beall Sinclair, 1878-1968, to clergyman and professor of theology Adolf Keller, 1872-1963.

The Howatt mss., 1902-1959, consist in the main of letters to David Howatt, 1882-1964 , farmer and secretary of Upton Beall Sinclair, from writers Harry Kemp, Upton Beall Sinclair, and William James Durant.

The Kimbrough mss., 1961-1967, consists of the correspondence of bond salesman Hunter Southworth Kimbrough, 1900-1994, concerning his relationship with his brother-in-law, Upton Beall Sinclair, 1878-1968.

The Haldeman mss. III, 1915-1918, consists primarily of correspondence of Upton Beall Sinclair, 1878-1968, novelist, and Appeal to Reason staff members Louis Kopelin, 1887-1949, and Walter H. Wayland, 1884-1980.

The Lesser mss., 1933-1971, consist chiefly of the correspondence between Sol Lesser, 1890-1980, motion picture executive, and Upton Beall Sinclair, 1878-1968, novelist, and others concerned with their interests.

The Lewin mss., 1958-1971, are letters to George Lionel Lewin, 1891-1978, bookdealer in Hove, Sussex, England.

The Kelley mss., 1907-1935, consists of letters written by writer Sinclair Lewis, 1885-1951, to novelist Edith Summers Kelley, (Mrs. Clyde F. Kelley), 1883-1956.

The Sinclair mss. VIII, 1939-1998, consist of financial documents, correspondence, and contracts from McIntosh & Otis during their representation of Upton Sinclair and the Sinclair estate through David Sinclair.

The Nikolaevskiî mss., 1938-1944, are letters and papers extracted from books collected by Boris Ivanovich Nikolaevskiî, 1887-1966, Russian revolutionary and author.

The Lush mss., 1956-1957, consists of two letters from Upton Beall Sinclair, 1878-1968, author, and a letter from Mrs. Mary Craig (Kimbrough) Sinclair, (Mrs. Upton Beall Sinclair), 1883-1961, author, to Samuel Beryl Lush, 1893?-?, cotton merchant.