Bob Lynch – författare

Arizona Rocks & Minerals

A Field Guide to the Grand Canyon State

Michigan Rocks & Minerals

A Field Guide to the Great Lake State

Lake Superior Agates Field Guide

Rocks & Minerals of Washington and Oregon

A Field Guide to the Evergreen and Beaver States

Agates of Lake Superior

Stunning Varieties and How They Are Formed

Rocks & Minerals of the United States

Quick Guide

Rocks & Minerals of California

Your Way to Easily Identify Rocks & Minerals

Lake Superior Rocks & Minerals Field Guide

A Field Guide to the Lake Superior Area

Turquoise

Identifying and Collecting the Southwest's Iconic Gemstone

Colorado Rocks & Minerals

A Field Guide to the Centennial State

Minnesota Rocks & Minerals

A Field Guide to the Land of 10,000 Lakes

Wonder of North American Agates

Rocks & Minerals of Wisconsin, Illinois & Iowa

A Field Guide to the Badger, Prairie & Hawkeye States

New York Rocks & Minerals

A Field Guide to the Empire State