The World Book encyclopedia volume 20 / 

 - Chicago :  World Book, Inc.,  1990. 
 - 990 :  col. ill. ;  26 cm. 
<br/><br/> Spine title: World book. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/> An encyclopedia designed especially to meet the needs of elementary, junior high, and senior high school students. 
<br/><br/><label>ISBN: </label>0716600900 
<br/><br/><label>LCCN: </label>89051290  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Encyclopedias and dictionaries.<br/>Encyclopedias and dictionaries.
<br/><br/><label>Dewey Class. No.: </label>031  / WOR