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Estados Unidos Geological Survey. (19). Geologic sections of Elm river mine (contact copper co.), T. 52 N., R. 36 W. U. S. Geological Survey.
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Dyfyniad Arddull Chicago
Estados Unidos Geological Survey. Geologic Sections of Elm River Mine (contact Copper Co.), T. 52 N., R. 36 W. U. S. Geological Survey, 19.
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Estados Unidos Geological Survey. Geologic Sections of Elm River Mine (contact Copper Co.), T. 52 N., R. 36 W. U. S. Geological Survey, 19.
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