Bibliography of North American Geology, 1968. 

 -- Washington :   United States Government Printing Office,   1971 
 - XLI, 1301 p. -- 
 (Geological Survey Bulletin  ; 1268).
<br/><br/><label>Subjects--Topical Terms: </label><br/>América del Norte<br/>Geología - Bibliografías
<br/><br/><label>Universal Decimal Class. No.: </label>55(7)(01)