Elephant John spotting den containing Indian Rhinoceros Bill, early 1920s. John Paterson was then menagerie superintendent for the Ringling Barnum and Bailey Circus. Photo H.A. Atwell
Plate XXXIII in Chindahl, G.L. 1959. A history of the circus in America. Caldwell, Ohio, Caxton printers. pp. i-xvi, 1-279.
