@misc{indiciae836f0fa452c8,
  title = {Changes in mallard breeding populations in relation to production and harvest rates},
  author = {Robert E. Reynolds and John R. Sauer},
  year = {1991},
  doi = {10.2307/3808979},
  url = {https://pubs.usgs.gov/publication/5222972},
  note = {Source identifier: 5222972}
}