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1by Yancey, H. F. (Harry Fagan), 1890-1970, Daniels, Joe, McMillan, E. R., Geer, M. R. (Max Richard), 1912-1981“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1943
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2“...Report of investigations (United States. Bureau of Mines) ;...”
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3by Hundhausen, Robert J.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1949
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