The newest addition to the DK Handbooks series, Smithsonian Handbook to Dinosaurs and Other Prehistoric Animals covers everyone's favorite beasts: dinosaurs and other prehistoric creatures, from wooly mammoths to Archaeopteryx. With detailed profiles of 200 dinosaur species, fullcolor illustrations and photographs to show actual excavation sites, this is the most comprehensive guide to these early creatures and the world they inhabited millions of years ago.
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More books that help you identify the best collecting locations in a state and the maps to get you there.
Gem Trails of Southern California
Gem Trails of Northern California
Gem Trails of Arizona
Gem Trails of Nevada
Gem Trails of Utah
Gem Trails of New Mexico
Gem Trails of Colorado
Gem Trails of Oregon
Gem Trails of Texas
Gem Trails of Washington
The GPS Guide to Western Gem Trails (accompaniment to above Gem Trails Guides)
Also great for rockhounds:

