"Palm Oases of Joshua Tree National Monument" (Joshua Tree, CA; Produced by National Park Service), 1974, Sub-Series 2.2, Box: 21, Folder: 4. Collection of California maps and guidebooks, SC-012. Pfau Library Special Collections. https://archivesspace.csusb.edu//repositories/3/archival_objects/10406 Accessed November 15, 2024.