"Imperial County California Dairying for Profit" (Imperial County, CA: Produced by Imperial County Board of Trade), undated, Sub-Series 2.2, Box: 15, Folder: 4. Collection of California maps and guidebooks, SC-012. Pfau Library Special Collections. https://archivesspace.csusb.edu//repositories/3/archival_objects/7055 Accessed November 15, 2024.