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1Published 1948“...Report of investigations (United States. Bureau of Mines) ;...”
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2by Thorne, Robert L.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1948
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3“...Report of investigations (United States. Bureau of Mines) ;...”
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Government Document eBook -
4by Wells, R. R.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1953
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Government Document eBook