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Maine Geological Survey, Open-File Map 10-44.
Maine Geological Survey
Aroostook County; Penobscot County
Bedrock Groundwater Resources Basic Data Maps
Tolman, Susan S. (compiler), 2010, Overburden thickness in the Houlton 30x60-minute quadrangle, Maine: Maine Geological Survey, Open-File Map 10-44, map, scale 1:125,000. Maine Geological Survey Maps. 1880. http://digitalmaine.com/mgs_maps/1880
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