Special Detective; Fact and Fiction Stories. Mount Morris, Illinois: Haig-Kostka Publications, Inc., September 1937

Special Detective; Fact and Fiction Stories. Mount Morris, Illinois: Haig-Kostka Publications, Inc., September 1937, Volume: Gilbert D970. Robert L. Gilbert First Issues collection, Gilbert. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/527542 Accessed December 27, 2025.