World book Inc. <br/><br/>
World book encyclopedia,Vol.20 

 - Chicago  World book Inc.  2013 
 - U 1-454p. 
<br/><br/><label>ISBN: </label>9780716601135 
<br/><br/><label>Subjects--Topical Terms: </label><br/>U-V
<br/><br/><label>Dewey Class. No.: </label>031  / WOR/W.20