Grolier Encyclopedia of Knowledge :   Complete set(1-20) 
edited by:HaFriedman Philip,Hacker Jeffrey H ,Roth Ronald B 
 - United States of America  Grolier International,  1995 
 - 415 pages;   illustrations,maps,  23 cm 
<br/><br/><label>ISBN: </label>0717253724 
<br/><br/><label>Dewey Class. No.: </label>030  / G89