Curtsinger, Bill. <br/><br/>
Swimming to safety / 
Bill Curtsinger. 
 - National Geographic Society :  Washington,  [s.f.]. 
 -  fot. ;  25 cm 
<br/><br/><label>ISSN: </label>00279358 
<br/><br/><label>Subjects--Index Terms: </label>Marsopas Animales en peligro de extinción