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Revised in 2006.National Geographic. Complete topographic map includes valuable wilderness tips and Leave No Trace guidelines, along with updated trails, trailheads, points of interest, campgrounds and much more. Printed on waterproof, tear-resistant material with a plastic coating for extreme durability. GPS compatible. Measures 4" x 9" folded and 25" x 37" fully opened, with one half of Isle Royale on each side of the map. Scale = 1:50,000.