Geis, Aelred D. <br/><br/>
Black duck distribution, harvest characteristic, and survival 

 - Washington :  Bureau of Sport Fisheries and Wildlife,  1971 
 - 241 p.  : mapas 
 - Special Scientific Report-Wildlife  ; 139 .
 - Special Scientific Report-Wildlife  ; 139 .
<br/><br/> Apénd. en 8 microtarjetas 
<br/><br/><label>LCCN: </label>12057 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Patos.
<br/><br/><label>Dewey Class. No.: </label>799.2484  / G4