@misc{indiciae768f64ac909a,
  title = {Photographic censusing of the 1982-1983 California condor population},
  author = {N.F.R. Snyder and E.V. Johnson},
  year = {1985},
  doi = {10.2307/1367123},
  url = {https://pubs.usgs.gov/publication/5221514},
  note = {Source identifier: 5221514}
}