@misc{indiciae352d8c3fb686,
  title = {A stochastic population model of mid-continental mallards},
  author = {Rolf R. Koford and J.R. Sauer and Douglas H. Johnson and J.D. Nichols and M.D. Samuel},
  year = {1992},
  url = {https://pubs.usgs.gov/publication/85646},
  note = {Source identifier: 85646}
}