The Ocean realm / 
prepared by the Special Publications Division, National Geographic Society,. 
 - Washington, D.C. :  The Society,  1978 
 - 199 p. :  ill. ;  26 cm. 
<br/><br/>Bibliography: p. 196. Includes index. 
<br/><br/> Open access. 
<br/><br/><label>ISBN: </label>0870442511 
<br/><br/><label>LCCN: </label>7793399  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Underwater exploration.<br/>Marine biology.