World book encyclopedia. 

 - Chicago:   World Book,   c1990. 
 - 20 volumes:  illustrations;  24 cm. 
<br/><br/><label>ISBN: </label>0-7166-0090-0 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Encyclopedias and dictionaries.
<br/><br/><label>Dewey Class. No.: </label>DRef 030   / W83