The New Book of Knowledge 20 

 - New York :   Grolier Incorporated,   c1986 
 - 442 p.  : ill 
<br/><br/>Includes Index 
<br/><br/>v. 20. W-X-Y-Z  
<br/><br/><label>ISBN: </label>07172051747 
<br/><br/><label>ISSN: </label>
<br/><br/><label>Subjects--Topical Terms: </label><br/>Children Encyclopedias
<br/><br/><label>Dewey Class. No.: </label>001.03  / NEW