Over 60,000 sold! This popular and easy-to-use guide is employed by tourists and rock-enthusiasts of every age to identify all those rocks seen on the beaches and shores of Lake Superior. Twelve detailed maps show the best beaches for picking. Learn about the profiles of various North Shore beaches and the types of rocks found there. Included are color illustrations of each type of rock, a description, tips for recognizing it and where to go to find it. Also includes a glossary and index for easy reference.