@misc{indiciae92b309b36825,
  title = {A comparison of methods used to obtain age ratios of snow and Canada geese},
  author = {Kenneth F. Higgins and R. L. Linder and P. F. Springer},
  year = {1969},
  doi = {10.2307/3799330},
  url = {https://pubs.usgs.gov/publication/1001477},
  note = {Source identifier: 1001477}
}