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1“...Report of investigations (United States. Bureau of Mines) ;...”
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2“...Report of investigations (United States. Bureau of Mines) ;...”
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3by Belser, Carl“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1951
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4by Wenger, W. J.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1957
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5“...Report of investigations (United States. Bureau of Mines) ;...”
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Government Document eBook -
6by Hazen, Scott W.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1949
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Government Document eBook