Indiana, Maine, Massachusetts, Michigan, New Hampshire, New Jersey, New York, Pennsylvania, Rhode Island, Vermont, and Wisconsin. The four volumes, with over 1,200 maps, describe over 5,000 specific sites; this Volume 1 includes over 300 to-scale maps marked with over 1,000 collecting sites and detailed directions on getting there, the types of rocks, minerals and fossils to be found at each site, and how and where to search once you've arrived.

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