System; A Monthly of Modern Business Practice. Chicago, Ill.: The System Company, June 1928

System; A Monthly of Modern Business Practice. Chicago, Ill.: The System Company, June 1928, Volume: Gilbert C513. Robert L. Gilbert First Issues collection, Gilbert. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/527679 Accessed December 27, 2025.