Archeological map of middle América :   land of the feathered serpent    Material no librario  [material gráfico] / 
compiled and drawn in the Cartographic Division of the National Geographic Magazine. 
 - Washington, D.C. :  National Geographic Magazine,  1968. 
 - 1 pliego pleg. (8 p.) ;  25 x 16 cm. 
<br/><br/> Catalogación preliminar.