"Recreation along Humboldt Highways" (Humboldt, CA: Produced by The Redwood Wonderland), undated, Sub-Series 2.2, Box: 25, Folder: 1. Collection of California maps and guidebooks, SC-012. Pfau Library Special Collections. https://archivesspace.csusb.edu//repositories/3/archival_objects/15381 Accessed January 09, 2026.