Whales, dolphins, and porpoises of the eastern North Pacific and adjacent Arctic waters :  a guide to their identification / 
Stephen Leatherwood ... [et al.]. 
 - [S.d.] :  U.S. Department of Commerce,  1982. 
 - 245 p. ;  il. ;  27 cm. 
<br/><br/><br/>Inglés 
<br/><br/><label>Dewey Class. No.: </label>599.5