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Ca. 300 letters; five annotated sketchbooks, 1906 and 1909; an expense account book, 1919-1924; 51 photographs; 2 sketches (one possibly of his son Gardner Cox); 50 drawings and blueprints; and an embossing stamp of the architect's seal.
Allen Howard Cox papers, 1900-1920. Archives of American Art, Smithsonian Institution.
Donated 1973 and 1989 by Professor Paul Norton.
Archives of American Art, Smithsonian Institution, 750 9th St. NW, Washington, D.C. 20001