Hacia lo desconocido :  historia de los descubrimientosInto the unknown : the story of exploration / 
[prepared by National Geographic Book Service]. 
 - Barcelona :  Plaza & Janés Editores ,  1989. 
 - 336 p.  ill. (some col.), maps.  29 cm. 
<br/><br/> Includes index.  Translation of : Into the unknown, the story of exploration. 
<br/><br/><label>ISBN: </label>8401607701 
<br/><br/><label>LCCN: </label>87005525 //r88 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Discoveries in geography
<br/><br/><label>LC Class. No.: </label>G80  / .I5818 1989 
<br/><br/><label>Dewey Class. No.: </label>910/.9