"Anza- Borrego Desert State Park...A Unit of the California State Park System" (Anza Borrego, CA: Produced by Not Available), undated, Sub-Series 2.1, Box: 15, Folder: 1. Collection of California maps and guidebooks, SC-012. Pfau Library Special Collections. https://archivesspace.csusb.edu//repositories/3/archival_objects/7021 Accessed November 15, 2024.