The Encyclopedia Americana volume 20 : Navajo to Opium 

 - International ed. 
 - Danbury, Conn. :  Grolier,  1992 
 - 776 p. 
<br/><br/><label>ISBN: </label>0717201236 
<br/><br/><label>Subjects--Topical Terms: </label><br/>ENCYCLOPEDIAS AND DICTIONARIES
<br/><br/><label>LC Class. No.: </label>AE5  / E529 1992