Grolier <br/><br/>
Encyclopedia of knowledge Vol 1 to 20 
Grolier. 
 - Danbury, Conn. :  Grolier,  c1991. 
 - 20 v. :  ill. (some col.), col. maps ;  25 cm. 
<br/><br/> Includes index. https://www.worldcat.org/title/grolier-encyclopedia-of-knowledge/oclc/671912249&referer=brief_results 
<br/><br/><label>ISBN: </label>0717253007 (set) 
<br/><br/><label>LCCN: </label>92121098  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Encyclopedias and dictionaries.--Encyclopedia
<br/><br/><label>LC Class. No.: </label>AE5  / .E478 1991 
<br/><br/><label>Dewey Class. No.: </label>030 GRO