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Maine Geological Survey, Progress Map 12-29.
Maine Geological Survey
Bedrock Geology Maps (scale 1:24,000)
Hussey, Arthur M., II, and Bothner, Wallace A., 2012, Bedrock geology of the Portsmouth quadrangle, Maine: Maine Geological Survey, Progress Map 12-29, color map, scale 1:24,000. Maine Geological Survey Maps. 63. http://digitalmaine.com/mgs_maps/63
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