["Anthropomorphic","Anza Borrego Desert","Bandits","California","Carrizo Gorge.","Cattle","gaskill_brothers","Goat Canyon","Goat Canyon Trestle","Imperial County","Impossible Railroad","Inkopah Mountains","McCain","Native American","petroglyph","Petroglyphs","pictograph","rock art","Rock Shelter","San Diego County","Smugglers Cave","Trestle","Unusual","Water Trough"]