The Hapgood, M.D., mss., 1912-1975, consists of the correspondence and writings of Socialist leaders Mary Donovan Hapgood, 1886-1973, and Powers Hapgood, 1899-1949.
The Walker mss., 1912-1920, consists of the correspondence of socialist leader Eugene Victor Debs, 1855-1926, to cartoonist Ryan Walker, 1870-1932, and author Mrs. Maud Helena (Davis) Walker, (Mrs. Ryan Walker), 1870-1925.
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 Lockhart, R. mss., 1906-1969, consist of the correspondence, writings and memorabilia of Sir Robert Hamilton Bruce Lockhart, 1887-1970, diplomat and writer.
The Lockhart, R. mss., 1906-1969, consist of the correspondence, writings and memorabilia of Sir Robert Hamilton Bruce Lockhart, 1887-1970, diplomat and writer.
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 Sinclair mss. IV, 1900-1963, consists of correspondence, writings, and monetary statements of author Upton Beall Sinclair, 1878-1968, and of his wife, Mary Craig (Kimbrough) Sinclair, 1883-1961.