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Cartographic Material
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U.S. Geological Survey,
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United States
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1. Geology of the conterminous United States at 1:2,500,000 scale a digital representation of the 1974 P.B. King and H.M. Beikman map /
Schruben, Paul G. U.S. Geological Survey,.
2. Mining claim activity on federal land in the United States
Causey, J. Douglas. U.S. Geological Survey,.