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 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.