TY  - RPRT
TI  - Breeding-ground habitat conditions and the survival of mallards
AU  - James D. Nichols
AU  - Richard S. Pospahala
AU  - James E. Hines
PY  - 1982
DO  - 10.2307/3808410
UR  - https://pubs.usgs.gov/publication/5221764
ID  - 5221764
ER  -