"Campgrounds Riverside County Southern California" (Riverside County, CA: Produced by Not Available), undated, Sub-Series 1.3, Box: 7, Folder: 4. Collection of California maps and guidebooks, SC-012. Pfau Library Special Collections. https://archivesspace.csusb.edu//repositories/3/archival_objects/6850 Accessed November 15, 2024.