@misc{indiciae1d0c7b791211,
  title = {California condor survey, 1971},
  author = {W.D. Carrier and R.D. Mallette and S. Wilbur and J.C. Borneman},
  year = {1972},
  url = {https://pubs.usgs.gov/publication/5224751},
  note = {Source identifier: 5224751}
}