The ocean realm / 
prepared by the Special Publications Division, National Geographic Society, Washington, D.C. 
 - Washington, D.C.:  The Society,  1978. 
 - 200 p. :  ill. ;  26 cm. 
<br/><br/> Includes index. 
<br/><br/>Bibliography : p.196. 
<br/><br/><label>ISBN: </label>0870442511  RM 5.75 
<br/><br/><label>LCCN: </label>77-93399 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Underwater exploration.<br/>Marine biology.