@misc{indiciae81ebbc158961,
  title = {A method to determine waterfowl shooting distances},
  author = {D.A. Davenport and G.A. Sherwood and H. W. Murdy},
  year = {1973},
  url = {https://pubs.usgs.gov/publication/1001633},
  note = {Source identifier: 1001633}
}