Spencer, Edgar Winston <br/><br/>
Introduction to the structure of the earth. 

 - 3rd ed. 
 - New York :  McGraw-Hill,  c1988. 
 - 551 p. :  il. ;  23 cm 
<br/><br/> p.483. 
<br/><br/><label>ISBN: </label>0070601984 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geología
<br/><br/><label>Index Terms--Genre/Form: </label><br/>Libro
<br/><br/><label>Universal Decimal Class. No.: </label>55