Carr, V.A.V., <br/><br/>
Mule and hybrid birds/ 
V.A.V. Carr 
 - London:  Cage Birds,  c1959 
 - 96 p.:  ill., col. plates;  19 cm. 
<br/><br/> Includes index 
<br/><br/><label>ISBN: </label> 8s. 6d. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Birds--Breeding<br/>Bird--Behavior<br/>Birds--Evolution<br/>Cage birds
<br/><br/><label>Dewey Class. No.: </label>636.686