Long John Latham's Collector's World. Conroe, Texas: Collector's World Publishing Company, Incorporated, January/February 1970

Long John Latham's Collector's World. Conroe, Texas: Collector's World Publishing Company, Incorporated, January/February 1970, Volume: Gilbert D198. Robert L. Gilbert First Issues collection, Gilbert. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/526559 Accessed December 28, 2025.