Orr, Robert Thomas,  1908- <br/><br/>
Vertebrate biology 
[by] Robert T. Orr. 
 - 3d ed. 
 - Philadelphia,  Saunders,  1971. 
 - vii, 544 p.  illus., maps.  25 cm. 
<br/><br/>Includes bibliographies. 
<br/><br/><label>ISBN: </label>0721670172 
<br/><br/><label>LCCN: </label>76139434 
<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