The World Book Encyclopedia: W-X-Y-Z  Volume 21 

 - Chicago  "World Book, Inc."  1997 
 - 622 pages 
<br/><br/> This volume of The World Book Encyclopedia covers topics beginning with the letters W, X, Y, and Z. It provides clear and useful information on people, places, science, history, culture, and many other subjects. 
<br/><br/><label>ISBN: </label>0716600978 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Reference works
<br/><br/><label>Index Terms--Genre/Form: </label><br/>General encyclopedias
<br/><br/><label>Universal Decimal Class. No.: </label>030  / T-44