TY  - RPRT
TI  - Distribution patterns during winter and fidelity to wintering areas of American black ducks
AU  - Duane R. Diefenbach
AU  - James D. Nichols
AU  - James E. Hines
PY  - 1988
DO  - 10.1139/z88-221
UR  - https://pubs.usgs.gov/publication/5220001
ID  - 5220001
ER  -