Nat. Geog. : Nos. 1-3 

 - Washington  Nat. Geog. Soc.  1997 
<br/><br/><label>Subjects--Topical Terms: </label><br/>U:1m73:M88
<br/><br/><label>Dewey Class. No.: </label>U:1m73:M88  / B8.192.1