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Maine Geological Survey, Open-File Map 99-96
Maine Geological Survey
Surficial Geology Maps (scale 1:24,000)
Smith, Geoffrey W. and Cameron, Cornelia C., 1999, Surficial geology of the Portsmouth quadrangle, Maine: Maine Geological Survey, Open-File Map 99-96, map, scale 1:24,000. Maine Geological Survey Maps. 1015. http://digitalmaine.com/mgs_maps/1015
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