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1Published 1990“...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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3“...Report of investigations (United States. Bureau of Mines) ;...”
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4by Knox, Clinton C.“...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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6by Stroud, Raymond B.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1970
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7by Riggs, C. H. (Calvin Harold), 1905-“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1963
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8“...Report of investigations (United States. Bureau of Mines) ;...”
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9“...Report of investigations (United States. Bureau of Mines) ;...”
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Government Document eBook