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Estados Unidos Geological Survey. (19). Plans of Calumet and Hecla conglomerate mine. U. S. Geological Survey.
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Estados Unidos Geological Survey. Plans of Calumet and Hecla Conglomerate Mine. U. S. Geological Survey, 19.
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Estados Unidos Geological Survey. Plans of Calumet and Hecla Conglomerate Mine. U. S. Geological Survey, 19.
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