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 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.