The world book encyclopedia. 

 - Chicago :  World Book International,  c 1982. 
 - Vols. :  ill. ;  26 cm. 
<br/><br/>Includes Bibliographies. 
<br/><br/>V. 20- U-V ; 
<br/><br/>344  344 
<br/><br/><label>ISBN: </label>0-7166-0082-X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Encyclopedias and dictionaries--America.
<br/><br/><label>Dewey Class. No.: </label>031 / W893