Voous, Karel H. <br/><br/>
Owls of the Northern Hemisphere 

 - U.K  Willian Collins  1988 
 - 320p. 
<br/><br/> Owls of the Northern Hemisphere presents the unique collaboration of the distinguished Dutch ornithologist Karel Voous and avian artist Ad Cameron. it is the definitive source of information on the 47 known owl species occurring north of the tropics. 
<br/><br/><label>ISBN: </label>978-0002194938 
<br/><br/><label>Dewey Class. No.: </label>598.97