World    book    vol. 21 

 - Chicago:  Pub.United States  0 
 - 618 pages 
 - 13 th. ed. .
<br/><br/><label>ISBN: </label>716600951 
<br/><br/><label>Subjects--Index Terms: </label>World Book. W-X, Y-Z. Vol. 21. 
<br/><br/><label>Dewey Class. No.: </label>30  / W 927