Orr, Robert T. <br/><br/>
Vertebrate biology / 
Robert T. Orr. 
 - 3rd edition. 
 - Philadelphia :  W. B. Saunders Company,  c1971. 
 - vii, 544 pages :  Illustrations ;  25 cm. 
<br/><br/>Includes bibliographies. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Vertebrates.
<br/><br/><label>LC Class. No.: </label>QL605  / .O7 1971 
<br/><br/><label>Dewey Class. No.: </label>596