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1by Herdlick, J. A.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1949
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2“...Report of investigations (United States. Bureau of Mines) ;...”
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3by Holmes, Wesley T.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1964
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4by Lorain, S. H.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1950
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Government Document eBook -
5“...Report of investigations (United States. Bureau of Mines) ;...”
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Government Document eBook