Pettingill, Olin Sewall <br/><br/>
A laboratory and field manual of ornithology 
illustrated by Walter J. Breckenridge. 
 - 3rd ed. 
 - Minneapolis  Burgess Pub. Co.  1956 
 - viii, 381 p.  illus. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ornithology