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Maine Geological Survey, Open-File Map 81-11
Maine Geological Survey
Bedrock Geology Maps (scale 1:62,500)
Gates, Olcott, 1981, Bedrock geology of the Machias, Columbia Falls, and Great Wass Island 15' quadrangles, Maine: Maine Geological Survey, Open-File Map 81-11, map, cross section, scale 1:62,500. Maine Geological Survey Maps. 311. http://digitalmaine.com/mgs_maps/311
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