Books (all call numbers and locations are in the Geology Library, unless otherwise noted)
Geology in the Field, by Robert R. Compton, 1985. QE45.C63 1985.
Manual of Field Geology, by Robert R. Compton, 1961. QE45.C65.
Pocket Guide Geology in the Field, by Tom McCann, 2021. Ebook.
Also, consult the The Geologic Guidebooks of North America Database. This contains references to geologic field trip guidebooks of North America (United States, Canada, Mexico). Most of the guidebooks cited are from the period 1940-the present.
The OwlsheadGPS OHV Trails app depicts the designated OHV route networks of participating pubic land management agencies in California. They have acquired their official OHV route data and combined them into a mobile app that is designed for outdoor enthusiast.