National Geographic <br/><br/>
Unlocking Secrets of the Uknown / 
National Geographic. 
 -  National Geographic Society,  1993. 
 - 200 
<br/><br/> Information on early expeditions, peoples past and present, observing animals, exploring the sea the future and more. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>expeditions<br/>animals<br/>people<br/>exploration<br/>future