The Clark mss., 1909-1957, consists of the letters and writings of author, editor, and publisher Thomas Curtis Clark, 1877-1953, as well as the autographs and poems of other writers collected by him.
The Chapman Mss., 1913-1922 and 1933, consists of the correspondence with and relating to Indian author Charles Edmonds Walk, 1875-, from the office file of president of the International Press Bureau, Chicago, Illinois William Gerard Chapman, 1877-1945.
The Catherwood mss., 1880-1902, consists of the letters of writer Mary (Hartwell) Catherwood (Mrs. James Steele Catherwood), 1847-1902, to Mary Elizabeth (Riley) Payne (Mrs. Frank C. Payne), 1864-1936, sister of James Whitcomb Riley.