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1by Holt, Stephen P.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1946
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Government Document eBook -
2by Heide, Harold E.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1946
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Government Document eBook -
3by Muir, Neal M.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1947
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Government Document eBook -
4by Heide, Harold E.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1948
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Government Document eBook