@misc{indiciae665e80a99358,
  title = {Distribution and abundance of predators that affect duck production--prairie pothole region},
  author = {A.B. Sargeant and R. J. Greenwood and M.A. Sovada and T.L. Shaffer},
  year = {1993},
  url = {https://pubs.usgs.gov/publication/2000081},
  note = {Source identifier: 2000081}
}