National Geographic Pocket Guide to Rocks and Minerals of North America

National Geographic Pocket Guide to Rocks and Minerals of North America (Pocket Guides)

Gemstone & Crystal Properties: a QuickStudy Laminated Reference Guide (QuickStudy Home)

The Rockhounding Encyclopedia: The Gem Hunter’s Guide to Identifying and Collecting Over 100 Unique Gemstones, Minerals, Fossils & Geodes | Featuring America’s Top 500 Rockhounding Sites