Koschmann, Albert Herbert 1896-1962
Principal gold-producing districts of the United States / by A. H. Koschmann and M. H. Bergendahl. -- Washington : United States Government Printing Office, 1968 - 283 p. -- (Geological Survey Professional Paper ; 610).
Estados Unidos
Oro - Producción
Yacimientos de oro
553.41(73) ; 669.213(73)
Principal gold-producing districts of the United States / by A. H. Koschmann and M. H. Bergendahl. -- Washington : United States Government Printing Office, 1968 - 283 p. -- (Geological Survey Professional Paper ; 610).
Estados Unidos
Oro - Producción
Yacimientos de oro
553.41(73) ; 669.213(73)