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The Sinclair mss., 1814-1968, consists of the correspondence, writings, and miscellaneous papers of author Upton Beall Sinclair, 1878-1968.

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.

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.

Consists of the correspondence and writings of Max Forrester Eastman, 1883-1969, author.