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Maine Geological Survey, Open-File Map 98-162
Maine Geological Survey
Surficial Materials Maps (scale 1:24,000)
Smith, Geoffrey W. (compiler) , 1998, Surficial materials of the Portsmouth quadrangle, Maine: Maine Geological Survey, Open-File Map 98-162, map, scale 1:24,000. Maine Geological Survey Maps. 716. http://digitalmaine.com/mgs_maps/716
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