TY  - RPRT
TI  - Distribution and abundance of predators that affect duck production--prairie pothole region
AU  - A.B. Sargeant
AU  - R. J. Greenwood
AU  - M.A. Sovada
AU  - T.L. Shaffer
PY  - 1993
UR  - https://pubs.usgs.gov/publication/2000081
ID  - 2000081
ER  -