Letter 1918 December 20, New York to Grobe & Noble / R. H. C., First National Exchange
Letter 16 March 1931 to H. D. Buckley / R. G. Hilton##Letter 18 March 1931 to R. G. Hilton / H. D...
Letter 1931 March 28, New York to Chaplin Studios / D. P. Mone, General Talking Pictures Corporation
Copyright certificates of "Modern Times" script and film / Library of Congress
Letter 1916 August 23, New York to Sydney Chaplin / John Freuler, Mutual Film Corporation
Charles Chaplin and Alfred Newman directing the orchestra