Orr, Robert T.  1908-1994 <br/><br/>
Vertebrate biology / 
Robert T. Orr. 
 - 2nd ed. 
 - Philadelphia :  W.B.Saunders Co.,  c1966. 
 - xii, 483 p. :  ill. ;  25 cm. 
<br/><br/>Includes bibliographies and index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Vertebrates.
<br/><br/><label>Dewey Class. No.: </label>596  / ORV 1966