The new book of knowledge:  Volume 20. W-X-Y-Z/ 

 - Danbury, Connecticut:  Scholastic Inc,   2008. 
 - x. 454 p.:  illustration 
<br/><br/><label>ISBN: </label>9780717205424 
<br/><br/><label>Subjects--Topical Terms: </label><br/>General encyclopedia works
<br/><br/><label>Dewey Class. No.: </label>M 030 N42 2008