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Maine Geological Survey, Open-File Map 11-106.
Maine Geological Survey
Coastal Sand Dune Geology Maps (scale 1:4,800)
Slovinsky, Peter A., and Dickson, Stephen M., 2011, Coastal sand dune geology: Hills Beach, Biddeford, Maine: Maine Geological Survey, Open-File Map 11-106, aerial photo, scale 1:4,800. Maine Geological Survey Maps. 462. http://digitalmaine.com/mgs_maps/462
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