The Frontier. Chicago: Research Foundation of Armour Institute of Technology, February 1938

The Frontier. Chicago: Research Foundation of Armour Institute of Technology, February 1938, Volume: Gilbert C201. Robert L. Gilbert First Issues collection, Gilbert. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/526024 Accessed March 22, 2026.