"Palomar Observatory San Diego, California" (San Diego, CA: Produced by the City of San Diego, California), undated, Sub-Series 2.4, Box: 17, Folder: 4. Collection of California maps and guidebooks, SC-012. Pfau Library Special Collections. https://archivesspace.csusb.edu//repositories/3/archival_objects/7136 Accessed November 15, 2024.