Alstine, Ralph E. van 1914-
Geology and mineral deposits of the Poncha springs SE quadrangle, chaffee county, Colorado / by Ralph E. van Alstine. -- Washington : United States Government Printing Office, 1974 - 19 p. + map. -- (Geological Survey Professional Paper ; 829).
Colorado
Depósitos de minerales
553(788)
Geology and mineral deposits of the Poncha springs SE quadrangle, chaffee county, Colorado / by Ralph E. van Alstine. -- Washington : United States Government Printing Office, 1974 - 19 p. + map. -- (Geological Survey Professional Paper ; 829).
Colorado
Depósitos de minerales
553(788)