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Maine Geological Survey, Open-File Map 71-7
Maine Geological Survey
Penobscot County; Piscataquis County
Bedrock Geology Maps (scale 1:62,500)
Griffin, John R., 1971, Reconnaissance bedrock geology of the Boyd Lake [15-minute] quadrangle, Maine: Maine Geological Survey, Open-File Map 71-7, map, scale 1:62,500. Maine Geological Survey Maps. 82. http://digitalmaine.com/mgs_maps/82
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