The Whisperer; The Long Arm of Justice. New York: Street and Smith Publications, Inc., October 1940

The Whisperer; The Long Arm of Justice. New York: Street and Smith Publications, Inc., October 1940, Volume: Gilbert D1257. Robert L. Gilbert First Issues collection, Gilbert. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/528036 Accessed December 27, 2025.