@misc{indiciae0e417f1a4b79,
  title = {Aerial surveys of Canada geese and black ducks in eastern Canada},
  author = {Charles F. Kaczynski and Everett B. Chamberlain},
  year = {1968},
  url = {https://pubs.usgs.gov/publication/ssrw118},
  note = {Source identifier: ssrw118}
}