ABSTRACTS OF THE NORTH AMERICAN GEOLOGY / 
U.S. Geological Survey. 
 -- Washington :   United States Dept. of the Interior, Governement printing office  
 - 1971. -- 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geología - Abstracts
<br/><br/><label>Universal Decimal Class. No.: </label>55(051.6)