Helvarg,  David. <br/><br/>
Blue frontier : saving America's living seas 

 - New York:  W H Freeman,  2001. 
 - 299p. 
<br/><br/><label>ISBN: </label>0716737159 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Marine resources<br/>Marine conservation <br/>United States