Orr, Robert Thomas, 1908-  Orr, Robert Thomas, 1908- <br/><br/>
Vertebrate biology / 
Robert T. Orr. 
 - 4th ed. 
 - Philadelphia :  Saunders,  1976. 
<br/><br/>Includes bibliographies and index. 
<br/><br/><label>ISBN: </label>0721670180 
<br/><br/><label>LCCN: </label>75019850 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Vertebrates.<br/>Vertebrates.
<br/><br/><label>LC Class. No.: </label>QL605  / .O7 1976 
<br/><br/><label>Dewey Class. No.: </label>596 
<br/><br/><label>National Library of Medicine Call No.: </label>QL605 O75v