TY  - JOUR
T1  - Trends in duck breeding populations
CY  - Laurel, MD :
CN  - I 49.106/2:
PB  - U.S. Fish and Wildlife Service, Office of Migratory Bird Management,
PP  - Laurel, MD :
N1  - "Administrative report."
N1  - Not distributed to depository libraries.
N1  - Description based on: 1955-93; title from caption.
ID  - 156293
KW  - Ducks
KW  - Bird populations
TI  - Trends in duck breeding populations
ER  -