TY  - RPRT
TI  - Applications of a simulation model to decisions in mallard management
AU  - L.M. Cowardin
AU  - Douglas H. Johnson
AU  - T.L. Shaffer
AU  - D. W. Sparling
PY  - 1988
UR  - https://pubs.usgs.gov/publication/2000132
ID  - 2000132
ER  -