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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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3“...Report of investigations (United States. Bureau of Mines) ;...”
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4by Wiebelt, Frank J.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1951
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5“...Report of investigations (United States. Bureau of Mines) ;...”
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6“...Report of investigations (United States. Bureau of Mines) ;...”
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7by Aune, Quintin A.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1959
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Government Document eBook