"Principal Automobile Routes of San Bernardino County California" (San Bernardino, CA: Produced by the Automobile Club of Southern California) [Quantity 2], undated, Sub-Series 1.4, Box: 22, Folder: 1. Collection of California maps and guidebooks, SC-012. Pfau Library Special Collections. https://archivesspace.csusb.edu//repositories/3/archival_objects/15207 Accessed January 09, 2026.