TY  - BOOK
AU  - Geis, Aelred D.
TI  - Black duck distribution, harvest characteristic, and survival
T2  - Special Scientific Report-Wildlife
U1  - 799.2484 
PY  - 1971///
CY  - Washington
PB  - Bureau of Sport Fisheries and Wildlife
KW  - Patos
N1  - Apénd. en 8 microtarjetas
ER  -