ROBINSON, Charles S. <br/><br/>
General geology of the Harold D. Roberts tunnel, Colorado / 
by Charles S. Robinson, Lawrence A. Warner and Ernest E. Wahlstrom. 
 -- Washington :   United States Government Printing Office,   1974 
 - 48 p. + map. -- 
 (Geological Survey Professional Paper  ;  831-B).
<br/><br/><label>Subjects--Topical Terms: </label><br/>Colorado<br/>Geología
<br/><br/><label>Universal Decimal Class. No.: </label>55(788)