Ballard, Robert D. <br/><br/>
Exploring our living planet / 
[by Robert D. Ballard ; prepared by National Geographic Book Service] 
 - Washington, D.C. :  National Geographic Society,  1983 
 - 366 p. :  col. ill. ;  29 cm. 
<br/><br/> Includes index 
<br/><br/>Bibliography : p. 359 
<br/><br/><label>LCCN: </label>83-002336 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Plate tectonics