@misc{indiciae8f2594810aff,
  title = {California condor survey, 1975},
  author = {S.R. Wilbur and R.D. Mallette and J.C. Borneman},
  year = {1977},
  url = {https://pubs.usgs.gov/publication/5221015},
  note = {Source identifier: 5221015}
}