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

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

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

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