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Maine Geological Survey, Open-File Map 11-143.
Maine Geological Survey
Coastal Sand Dune Geology Maps (scale 1:4,800)
Slovinsky, Peter A., and Dickson, Stephen M., 2011, Coastal sand dune geology: River Beach, Fort Popham, Phippsburg: Maine Geological Survey, Open-File Map 11-143, aerial photo, scale 1:4,800. Maine Geological Survey Maps. 383. http://digitalmaine.com/mgs_maps/383
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