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1by Biggs, Paul“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1976
Government Document Book -
2by Bennetts, J. (John)“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1981
Government Document Book -
3by Smith, G. E. (Gregory E.)“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1980
Government Document Book -
4by Morrice, E. (Edward)“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1984
Government Document Book