GEOLOGICAL SURVEY BULLETIN / 
U.S. Geological Survey. 
 -- Washington :   Department of the Interior, Government printing office  
 - 1949-1983. -- 
<br/><br/>ISSN 0364-4510 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geología
<br/><br/><label>Universal Decimal Class. No.: </label>55(08)