Maine Geological Survey, Open-File Map 21-12.
Maine Geological Survey
Bedrock Geology Maps (scale 1:24,000)
Wang, Chunzeng, 2021, Bedrock geology of the Big Machias Lake quadrangle, Maine: Maine Geological Survey, Open-File Map 21-12, scale 1:24,000. Maine Geological Survey Maps. 2145. https://digitalmaine.com/mgs_maps/2145
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