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1by Beard, H. R.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1980
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2Published 1981“...Report of investigations (United States. Bureau of Mines) ;...”
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3by Thimons, Edward D.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1986
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4“...Report of investigations (United States. Bureau of Mines) ;...”
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5by Soulé, J. H. (John H.)“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1949
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