"Elephant Trees Discovery Trail...Anza-Borrego Desert State Park" (Anza Borrego, CA: Produced by the State of California- the Resources Agency Department of Parks & Recreation), 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/7022 Accessed November 15, 2024.