A Field Guide to the Lake Superior Area By Bob Lynch and Dan Lynch Get the definitive field guide by rock expert Bob Lynch and his son Dan. This handy, durable book features photographs that depict the detail needed for identification--no more guessing from line drawings! Get all of the information needed to learn about and to identify the many rocks you'll encounter when hiking, camping, exploring or strolling along the beaches of Minnesota, Wisconsin and Michigan. 208 pages. 4-3/8" x 6" softcover.