The Philatelic Crusader: Just, Frank and Fearless. Brooklyn, N.Y.: Crusader Publishing Co., June 1936

The Philatelic Crusader: Just, Frank and Fearless. Brooklyn, N.Y.: Crusader Publishing Co., June 1936, Volume: Gilbert C367. Robert L. Gilbert First Issues collection, Gilbert. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/527014 Accessed December 26, 2025.