The World Book Encyclopedia W.X.Y.Z no.21 

 - 610 hlm.  ilus.  26 cm 
<br/><br/><label>ISBN: </label>0-7166-0106-0 
<br/><br/><label>Subjects--Topical Terms: </label><br/>0
<br/><br/><label>Index Terms--Genre/Form: </label><br/>Grade 10-12
<br/><br/><label>Dewey Class. No.: </label>032.