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1by Holmes, Wesley T.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1964
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2“...Report of investigations (United States. Bureau of Mines) ;...”
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3by Allsman, Paul Trekell, 1898-“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1949
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4by Allsman, Paul Trekell, 1898-“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1949
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5“...Report of investigations (United States. Bureau of Mines) ;...”
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Government Document eBook