Grolier encyclopedia of knowledge. 

 - International edition. 
 - 20 volumes :  some colored illustrations ;  24 cm. 
<br/><br/>v.1-v.20. 
<br/><br/>  
<br/><br/><label>ISBN: </label>0717253724 (set) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Encyclopiedias and dictionaries.
<br/><br/><label>Dewey Class. No.: </label>031/G89