"San Bernardino The Gate City of Southern California" (San Bernardino, CA: Produced by John Flagg), undated, Sub-Series 2.4, Box: 25, Folder: 2. Collection of California maps and guidebooks, SC-012. Pfau Library Special Collections. https://archivesspace.csusb.edu//repositories/3/archival_objects/15393 Accessed January 10, 2026.