Detective Dime Novels. New York, N.Y.: The Frank A. Munsey Company, April 1940

Detective Dime Novels. New York, N.Y.: The Frank A. Munsey Company, April 1940, Volume: Gilbert C137. Robert L. Gilbert First Issues collection, Gilbert. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/525748 Accessed December 26, 2025.