Railroad Modeler. Canoga Park, California: Challenge Publications, Inc., September 1971

Railroad Modeler. Canoga Park, California: Challenge Publications, Inc., September 1971, Volume: Gilbert D841. Robert L. Gilbert First Issues collection, Gilbert. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/527261 Accessed December 27, 2025.