Doc Savage Magazine. New York. N.Y.: Street and Smith Publications, Inc., March 1933

Doc Savage Magazine. New York. N.Y.: Street and Smith Publications, Inc., March 1933, Volume: Gilbert C150. Robert L. Gilbert First Issues collection, Gilbert. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/525780 Accessed December 26, 2025.