@misc{indiciaee38b22980efe,
  title = {Population ecology of the mallard VIII: Winter distribution patterns and survival rates of winter-banded mallards},
  author = {James D. Nichols and James E. Hines},
  year = {1987},
  url = {https://pubs.usgs.gov/publication/5230162},
  note = {Source identifier: 5230162}
}