@misc{indiciaefcf0ca23004a,
  title = {1970 test of the point system for regulating duck harvests},
  author = {A. D. Geis and W.F. Crissey},
  year = {1973},
  url = {https://pubs.usgs.gov/publication/5222375},
  note = {Source identifier: 5222375}
}