@misc{indiciae05cd774229dc,
  title = {Establishing hunting regulations and allowable harvest of mallards in the United States},
  author = {A. D. Geis and R. K. Martinson and David R. Anderson},
  year = {1969},
  doi = {10.2307/3799316},
  url = {https://pubs.usgs.gov/publication/5220657},
  note = {Source identifier: 5220657}
}