1. Alex mss., 1910-1935 6 Folders
Sinclair, Upton, 1878-1968
The Alex mss., 1910-1935, consists of letters from author Upton Beall Sinclair, 1890-1968, to lawyer and fellow socialist Tanna Alex, 1884-1982.
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2. Armour mss., 1952-1956 1 folio
Sinclair, Upton, 1878-1968
The Armour mss., 1952-1956, consists of letters from author Upton Sinclair, 1878-1968, to author and English professor Richard Willard Armour, 1906-1989.
3. Boni mss., 1926-1939 1 Box (1 standard)
Sinclair, Upton, 1878-1968
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.
4. Cane mss., 1936-1957 1 folio
Sinclair, Upton, 1878-1968
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.
5. Colorado-Sinclair mss., 1950 1 folio
Sinclair, Upton, 1878-1968
The Colorado-Sinclair mss. consists of letters exchanged between author, Upton Beall Sinclair, 1878-1968, and University of Colorado Director of Libraries Eugene Holt Wilson, 1909-?, Boulder, Colorado, August 25-October 31, 1950.
6. DeWitt mss., 1941-1955 1 folio
Sinclair, Upton, 1878-1968
The DeWitt mss., 1941-1955, consists of letters from Upton Sinclair, 1878-1968, author, to Samuel Aaron DeWitt, 1891-1963, poet and businessman, and correspondence between Mary Craig (Kimbrough) Sinclair, (Mrs. Upton Sinclair), 1883-1961, and DeWitt.
7. Eeden mss., 1908-1918 1 Box (1 standard)
Sinclair, Upton, 1878-1968
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.
8. Haldeman mss. III, 1915-1918 1 Box (1 standard)
Sinclair, Upton, 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.
9. Howatt mss., 1902-1959 1 Box (1 standard)
Sinclair, Upton, 1878-1968
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.
10. Keller mss., 1938-1953 0.1 Linear Feet (1 folio)
Sinclair, Upton, 1878-1968
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.