The World Book Encyclopaedia  Vol. 20 

 - London :  World Book International,  1992 
 - 430 p. 
<br/><br/><label>ISBN: </label>0-7166-6696-0 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Generalities
<br/><br/><label>Subjects--Facted Index Terms: </label><br/>Encyclopedia
<br/><br/><label>Dewey Class. No.: </label>031  / THE-T.20