Nat. Geo. : July-dec. 1973 

 - Washington  Nat.Geo. Soc.  1973 
<br/><br/><label>Subjects--Topical Terms: </label><br/>U:1m73:M88
<br/><br/><label>Dewey Class. No.: </label>U:1m73:M88  / B8.144