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Maine Geological Survey, Special Economic Studies Series 8
Maine Geological Survey
Slack, John F., 1980, Tourmaline; a prospecting guide for massive base-metal sulfide deposits in the Penobscot Bay area, Maine: Maine Geological Survey, Special Economic Studies Series 8, 25 p.. Maine Geological Survey Publications. 525. http://digitalmaine.com/mgs_publications/525
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