101 American Geo-Sites you've gotta see
Geology and Lore of Northern Anza-Borrego Desert Region - The Lows to Highs of Anza-Borrego Desert State Park
Mining History and Geology of Joshua Tree National Park
Picacho and the Cargo Muchachos: Gold, Guns, and Geology Eastern Imperial County, California: SDAG 2011 Annual Field Trip
Roadside Geology of Northern and Central California
