Focusing on California rocks and minerals, this tabbed booklet features detailed photographs, organized by rocks/minerals and then by general appearance, to hel

This most complete guide to Northern California features sites from the Oregon border south to San Luis Obispo. Beautiful color photographs showcase the specime

Californians live on the edge . . . of a tectonic plate, that is. In this geologically tenuous location, where a tsunami, earthquake, or volcanic eruption is ju