The National Geographic Magazine :  April, 1957 

 - 1a 
 - Washington :   National Geographic Society ,  1957 
 - The National Geographic Magazine   Volumen CXI Nº 4 .
<br/><br/> Inv univ 6907 
<br/><br/><label>Standard No.: </label>DGR-M11583 
<br/><br/><label>Subjects--Topical Terms: </label><br/>INTERÉS GENERAL
<br/><br/><label>Universal Decimal Class. No.: </label>91