Orr, Robert T.  1908-1994. <br/><br/>
Animals in migration / 
[by] Robert T. Orr. 
 - [New York] :  Macmillan,  [1970]. 
 - xv, 303 p. :  il. (som col.), maps ;  24 cm. 
<br/><br/>Bibliografía: p. 271-288. 
<br/><br/><br/>Ingles 
<br/><br/><label>LCCN: </label>72081553  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Animal migration.
<br/><br/><label>Subjects--Index Terms: </label>Migración de los animales. 
<br/><br/><label>LC Class. No.: </label>QL754  / .O77 
<br/><br/><label>Dewey Class. No.: </label>591.568