Orr, Robert T. <br/><br/>
Vertebrate biology / 
Robert T. Orr. 
 - 4th ed. 
 - Philadelphia :  Saunders,  1976. 
 - vii, 472 p. :  ill. ; 
<br/><br/><label>ISBN: </label>0721670180 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Vertebrates.<br/>Vertebrates.
<br/><br/><label>LC Class. No.: </label>QL605  / .O7 1976