Discovering Great Lakes Dunes Author:Earl Wolf, Elizabeth Brockwell-Tillman, Ken Fettig, Leslie Johnson Formed thousands of years ago, sand dunes along the Great Lakes shorelines are the most extensive freshwater dunes in the world and attract countless visitors each year. Discovering Great Lakes Dunes captures the beauty of these unique geological features and highlights their rich diversity. The32 page booklet features color photos of som... more »e of the most dramatic dunes in the Great Lakes region as well as valuable information about their ecology.« less