Dugan, Robert. <br/><br/>
World beneath the sea / 
by Robert Dugan. 
 -  National Geographic Society,  1967. 
 - 204 p. :  col,ill, photographs. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ocean bottom.<br/>Oceanography.
<br/><br/><label>LC Class. No.: </label>GC 83  / .D8