"Highway Map of Northern California" (Produced by Shell Company of California) [Quantity 2], 1926, Sub-Series 1.5, Box: 22, Folder: 4. Collection of California maps and guidebooks, SC-012. Pfau Library Special Collections. https://archivesspace.csusb.edu//repositories/3/archival_objects/15231 Accessed January 10, 2026.