@misc{indiciae2ef02ba12598,
  title = {Sex ratios and age raios in North American ducks},
  author = {Frank C. Bellrose and Thomas G. Scott and Arthur S. Hawkins and Jessop B. Low},
  year = {1961},
  doi = {10.21900/j.inhs.v27.175},
  url = {https://pubs.usgs.gov/publication/70243783},
  note = {Source identifier: 70243783}
}