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Estados Unidos Geological Survey. (19). Geologic map of copper range from Mount Houghton to Delaware, Michigan. U. S. Geological Survey.
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Estados Unidos Geological Survey. Geologic Map of Copper Range from Mount Houghton to Delaware, Michigan. U. S. Geological Survey, 19.
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Estados Unidos Geological Survey. Geologic Map of Copper Range from Mount Houghton to Delaware, Michigan. U. S. Geological Survey, 19.
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