"Arrowhead Hot Springs Radio Active...The Hottest Curative Springs" (Arrowhead Springs, 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/7023 Accessed November 15, 2024.