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Maine Geological Survey, Open-File Map 78-20. Includes parts of the Greenlaw and Presque Isle 15' quadrangles
Maine Geological Survey
Bedrock Geology Maps (scale 1:62,500)
Roy, David C., 1978, Bedrock geology of the Ashland 15' quadrangle and surrounding area, Maine: Maine Geological Survey, Open-File Map 78-20, map, cross section, scale 1:62,500. Maine Geological Survey Maps. 303. http://digitalmaine.com/mgs_maps/303
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