@misc{indiciae5555383fce49,
  title = {California condor surveys, 1968},
  author = {F.C. Sibley and R.D. Mallette and J.C. Borneman and R.S. Dalen},
  year = {1969},
  url = {https://pubs.usgs.gov/publication/5220173},
  note = {Source identifier: 5220173}
}