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Maine Geological Survey, Open-File Map 78-21. Covers parts of Ashland, Caribou, Portage, Presque Isle, Square Lake, and Stockholm 15' quadrangles
Maine Geological Survey
Bedrock Geology Maps (scale 1:62,500)
Roy, David C. (compiler) , 1978, Geologic map of a portion of northeastern Aroostook County, Maine: Maine Geological Survey, Open-File Map 78-21, map, scale 1:62,500. Maine Geological Survey Maps. 304. http://digitalmaine.com/mgs_maps/304
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