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1“...Report of investigations (United States. Bureau of Mines) ;...”
Government Document Book -
2“...Report of investigations (United States. Bureau of Mines) ;...”
Government Document Book -
3“...Report of investigations (United States. Bureau of Mines) ;...”
Government Document Book -
4by Biordi, Joan C.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1978
Government Document Book -
5by Papp, John F.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1981
Government Document Book