@misc{indiciae172d96f2f7e3,
  title = {Annual and shooting mortality estimates for the canvasback},
  author = {A. D. Geis},
  year = {1959},
  doi = {10.2307/3796883},
  url = {https://pubs.usgs.gov/publication/5220662},
  note = {Source identifier: 5220662}
}