Alstine, Ralph E. van  1914- <br/><br/>
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).
<br/><br/><label>Subjects--Topical Terms: </label><br/>Colorado<br/>Depósitos de minerales
<br/><br/><label>Universal Decimal Class. No.: </label>553(788)