Philatelic Digest. Winfield, Kansas: Phil Allen Stamp Company, May 15, 1936

Philatelic Digest. Winfield, Kansas: Phil Allen Stamp Company, May 15, 1936, Volume: Gilbert C370. Robert L. Gilbert First Issues collection, Gilbert. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/527016 Accessed December 27, 2025.