@misc{indiciae950af21b2bbe,
  title = {Incidence of embedded shot in canvasbacks},
  author = {Matthew C. Perry and Paul H. Geissler},
  year = {1980},
  doi = {10.2307/3808317},
  url = {https://pubs.usgs.gov/publication/5221570},
  note = {Source identifier: 5221570}
}