Earle, Sylvia A.,  1935- <br/><br/>
Exploring the deep frontier :  the adventure of man in the sea / 
by Sylvia A. Earle and Al Giddings ; prepared by the Special Publications, National Geographic Society, Washington, D.C. 
 - Washington, D.C. :  National Geographic Society,  1980 
 - 296 p. ;  33 cm. 
<br/><br/><label>ISBN: </label>0870443437  14.95 
<br/><br/><label>LCCN: </label>80-007567 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Underwater exploration<br/>Diving, Submarine