Peterson, Roger Tory  1908-1996 <br/><br/>
A field guide to western birds / 
Roger Tory Peterson. 
 - Second Edition  Revised and Enlarged 
 - Cambridge, MA, U.S.A. :  Houghton Mifflin Company Boston,  1961. 
 - 366 p. ;  il. ;  19 cm. 
 - The Peterson Field Guide Series .
<br/><br/><br/>Inglés 
<br/><br/><label>Subjects--Index Terms: </label>Birds Aves 
<br/><br/><label>Dewey Class. No.: </label>598.2978