@misc{indiciae2e0840ba940b,
  title = {Third cooperative survey of the California condor},
  author = {F.C. Sibley and R.D. Mallette and J.C. Borneman and P.S. Dalen},
  year = {1968},
  url = {https://pubs.usgs.gov/publication/5220174},
  note = {Source identifier: 5220174}
}