National geographic,  ;   Vol. 161, no. 5 

 - Washington-XXU  :   National Geographic Society,   1982. 
 - p. 681-690 :   il. 
 - Irregular 
 - Vol. 161, no. 5(May. 1982) 
 - National geographic,  ;   Vol. 161, no. 5 .
 - National Geographic Society. .
<br/><br/> Las p ginas no est n num‚ricamente correlativas.