The world book encyclopedia: volume 21 WXYZ 

 - Chicago:  World book, Inc;  2018. 
 - 610 Pages:  Colour illustrations;  25.5 cm 
 - World book .
<br/><br/><label>ISBN: </label>9780716601180 
<br/><br/><label>Dewey Class. No.: </label>R 031 WORL