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Maine Geological Survey, Open-File Map 80-8
Maine Geological Survey
Surficial Geology Maps (scale 1:62,500)
Genes, Andrew N., 1980, Reconnaissance surficial geology of the Portage [15-minute] quadrangle, Maine: Maine Geological Survey, Open-File Map 80-8, map, scale 1:62,500. Maine Geological Survey Maps. 586. http://digitalmaine.com/mgs_maps/586
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