Handbook of marine mammals / 
edited by Sam H. Ridgway & Richard Harrison. 
 - London ;  New York :  Academic Press,  1981- 
 - v. :  ill. ;  23 cm. 
<br/><br/>v.1 The walrus, sea lions, fur seals, and sea otter - v.2 Seals - v.4 River dolphins and the larger toothed whales. 
<br/><br/><label>ISBN: </label>0125885040 (v.4) 
<br/><br/><label>LCCN: </label>90032092 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Marine mammals.