Grolier encyclopedia of knowledge. 

 - Dunburry, Conn. :  Grolier Inc.,  c1991. 
 - 20vols. : ill. ; 25 cm. 
<br/><br/><label>ISBN: </label>0717253007 (set) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Encyclopedias and dictionaries.