The World book encyclopedia. 

 - Chicago :  World book,  c 1998. 
 - Vols. :  ill. ;  25 cm. 
<br/><br/>V. 20- (U-V) ; 
<br/><br/>314  314 
<br/><br/><label>ISBN: </label>0-7166-0098-6 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Encyclopedia.<br/> Encyclopedias and dictionaries.
<br/><br/><label>Dewey Class. No.: </label>031 / W893