@misc{indiciae109dbfe7544e,
  title = {Determination of age and whelping dates of live red fox pups},
  author = {Alan B. Sargeant and Stephen H. Allen and Douglas H. Johnson},
  year = {1981},
  doi = {10.2307/3808715},
  url = {https://pubs.usgs.gov/publication/1001303},
  note = {Source identifier: 1001303}
}