Lake Superior Agates Field Guide
Beginner or expert, this is your guide to Lake Superior Agates
The book features four pages of photos and facts for every type of agate found in Michigan, Minnesota, Wisconsin and southern Ontario. The easy-to-use format means you'll quickly find what you need to know and where to look, while the authors' photographs depict the detail needed for identification - no need to guess from line drawings. Identify your finds quickly and easily with this all-in-one resource!
Adventure Publications, 2012