Drill hole CS30, Campbell-Sherwood Prospect, Menominee iron range, Iron Co., Michigan, USA
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Detailed Mineral List:
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James, H. L., Pettijohn, F. J., Clark, L. D. (1970) "Geology and Magnetic Data Between Iron River and Crystal Falls, Michigan", Geological Survey Division of the Department of Natural Resources, State of Michigan, Lansing, pl. 1, p. 6.