Salt: A World History

Material World: The Six Raw Materials That Shape Modern Civilization

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

Rocks & Minerals of Washington and Oregon: A Field Guide to the Evergreen and Beaver States (Rocks & Minerals Identification Guides)

Fists Full of Gold: A Complete Guide to the Art of Prospecting: How You Can Find Gold in the Mountains and Deserts

The Minerals Encyclopedia: 700 Minerals, Gems and Rocks

Gem

Read My Pins: Stories from a Diplomat's Jewel Box

Gemstone Tumbling, Cutting, Drilling & Cabochon Making: A Simple Guide to Finishing Rough Stones

Finding Gold in Colorado: Prospector’s Edition: A guide to Colorado's casual gold prospecting, mining history and sightseeing