Rezultati - U.S.Geological Survey
Priporočene teme znotraj vašega iskanja.
Priporočene teme znotraj vašega iskanja.
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General geologic map and sections of the Keweenawan and associated rocks in the lake superior copper district
“...U. S. Geological Survey...”
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Topographic map of the central portion of copper range, painesdale to Cliff, Michigan
“...U. S. Geological Survey...”
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Geologic map of copper range from end of Keweenaw Point to Mount Houghton, Michigan
“...U. S. Geological Survey...”
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General geologic map from Presque isle river to Victoria mine, Michigan
“...U. S. Geological Survey...”
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Manitou-Frontenac, Keweenaw, and North Cliff geologic sections
“...U. S. Geological Survey...”
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Geologic sections of Quincy mine, T. 55 N., R. 34 W., Houghton County, Mich.
“...U. S. Geological Survey...”
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Geologic sections in T. 53 N., R. 35 W., and T. 54 N., R. 34 W.
“...U. S. Geological Survey...”
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Geologic sections of copper range diamond-drill holes, T. 53 N., R. 35 W.
“...U. S. Geological Survey...”
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Geologic sections in T. 52 N., R. 36 W., and T. 53 N., R. 35 W.
“...U. S. Geological Survey...”
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Geologic sections of Elm river mine (contact copper co.), T. 52 N., R. 36 W.
“...U. S. Geological Survey...”
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Geologic sections in T. 51 N., R. 37 W., and TPS. 50 and 51 N., R. 38 W.
“...U. S. Geological Survey...”
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Geologic sections in T. 50 N., RS. 38 and 39 W. and T. 51 N., R. 38 W.
“...U. S. Geological Survey...”
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