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1Published 1984“...Report of investigations (United States. Bureau of Mines) ;...”
Government Document Book -
2by Siskind, D. E.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1987
Government Document Book -
3Published 1989“...Report of investigations (United States. Bureau of Mines) ;...”
Government Document Book -
4by Reeves, John R.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1923
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