Dunbar, Carl O. <br/><br/>
Principles of stratigraphy 

 - New York  John Wiley &amp; Sons  1958 
 - 356 p.  ilus. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>ESTRATIGRAFÍA
<br/><br/><label>Universal Decimal Class. No.: </label>551.7=20/D92