Headline Detective; "America's Streamlined Fact-Detective Magazine" New York: Headline Detective Publishing Company, July 1939

Headline Detective; "America's Streamlined Fact-Detective Magazine" New York: Headline Detective Publishing Company, July 1939, Volume: Gilbert D421. Robert L. Gilbert First Issues collection, Gilbert. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/526156 Accessed December 28, 2025.