Rocks, Gems, and Minerals of the Rocky Mountains is a field guide to more than 130 of the most common and sought-after rocks, gems, and minerals hidden througho

Rocks, Gems, and Minerals of the Southwest is a field guide to more than 100 of the most common and sought-after rocks, gems, and minerals hidden throughout the

This famous book takes you on an extensive gem and mineral collecting tour of Colorado, revealing the interesting places where Nature has stored her treasures.

Answering intriguing questions such as Why does the largest river system in North America meander across the middle of the continent? and How does such a system