Four letters written by Sinclair and a printed circular listing his publications. The letters include an ALS (no year April 16; New York, N.Y.) to Richard Watson Gilder asking for his opinion on Sinclair's work titled, Springtime and Harvest (1910); TLS (1906 April 12; Princeton, N.J.) to the North American Review regarding copyright of an article written by Sinclair; TLS (1945 March 16; Monrovia, Calif.) to Sylvia Simon (later Sylvia Simon Tansey) answering her question about the faculty of the University of California at Los Angeles; and ALS (1964 April 16; Monrovia, Calif.) from Sinclair to Regina Emmerich responding to an unidentified request.