Lexicon universal encyclopedia.  Volume 20,  W-X-Y-Z / 

 - Deluxe home ed. 
 - New York:  Lexicon Publications, Inc.,  c1991. 
 - 384 pages :  colored illustrations, maps ;  26 cm. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>0717220354 (cb.)