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Maine Geological Survey, Open-File Map 12-12 (Superseded by Weddle, 2014, Maine Geological Survey Open-File 14-25).
Maine Geological Survey
Knox County; Lincoln County
Surficial Geology Maps (scale 1:24,000)
Thompson, Woodrow B., 2012, Surficial geology of the Union quadrangle, Maine: Maine Geological Survey, Open-File Map 12-12 (Superseded by Weddle, 2014, Maine Geological Survey Open-File 14-25), map, scale 1:24,000. Maine Geological Survey Maps. 2104. https://digitalmaine.com/mgs_maps/2104
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