Wells, John D.  1946- <br/><br/>
Geology of the Eldorado springs quadrangle boulder and Jefferson counties, Colorado / 
by John D. Wells. 
 -- Washington :   United States Government Printing Office,   1967 
 - 85 p. + map. -- 
 (Geological Survey Bulletin  ;  1221-D).
<br/><br/><label>Subjects--Topical Terms: </label><br/>Colorado<br/>Petrología
<br/><br/><label>Universal Decimal Class. No.: </label>552(788)