Varnes, David Joseph 1919-
Geology and ore deposits of the south Silverton mining area, San Juan county, Colorado / by David J. Varnes. -- Washington : United States Government Printing Office, 1963 - 56 p. + map. -- (Geological Survey Professional Paper ; 378-A).
Colorado
Depósitos de minerales
Geología
553(788)
Geology and ore deposits of the south Silverton mining area, San Juan county, Colorado / by David J. Varnes. -- Washington : United States Government Printing Office, 1963 - 56 p. + map. -- (Geological Survey Professional Paper ; 378-A).
Colorado
Depósitos de minerales
Geología
553(788)