"Big Bear Valley San Bernardino County California" (Big Bear Valley, CA: Produced by Morgan & Stevenson), Undated, Sub-Series 1.1, Box: 22, Folder: 2. Collection of California maps and guidebooks, SC-012. Pfau Library Special Collections. https://archivesspace.csusb.edu//repositories/3/archival_objects/15213 Accessed January 10, 2026.