Nat. Geo. : Nos. 4-6 

 - Washington  Nat. Geo. Soc.  1989 
<br/><br/><label>Subjects--Topical Terms: </label><br/>U:1m73:M88
<br/><br/><label>Dewey Class. No.: </label>U:1m73:M88  / B8.176.2