Alstine, Ralph E. van 1914-
Geology and mineral deposits of the Poncha springs NE Quadrangle, Chaffee county, Colorado / by Ralph E. Van Alstine. -- Washington : United States Government Printing Office, 1969 - 52 p. + map. -- (Geological Survey Professional Paper ; 626).
Colorado
Depósitos de minerales
553(788)
Geology and mineral deposits of the Poncha springs NE Quadrangle, Chaffee county, Colorado / by Ralph E. Van Alstine. -- Washington : United States Government Printing Office, 1969 - 52 p. + map. -- (Geological Survey Professional Paper ; 626).
Colorado
Depósitos de minerales
553(788)