Principles of the mineral resource classification system of the U.S. Bureau of Mines and U.S. Geological Survey (Q114214)

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Principles of the mineral resource classification system of the U.S. Bureau of Mines and U.S. Geological Survey; 1976; B; 1450-A; Geological Survey (U.S.)
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Principles of the mineral resource classification system of the U.S. Bureau of Mines and U.S. Geological Survey
Principles of the mineral resource classification system of the U.S. Bureau of Mines and U.S. Geological Survey; 1976; B; 1450-A; Geological Survey (U.S.)

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