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1by Riggs, C. H. (Calvin Harold), 1905-“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1963
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2by Riggs, C. H. (Calvin Harold), 1905-“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1949
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Government Document eBook -
3“...Report of investigations (United States. Bureau of Mines) ;...”
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Government Document eBook