@misc{indiciaed8ba8f5d5bb0,
  title = {Sightability adjustment methods for aerial surveys of wildlife populations},
  author = {R.K. Steinhorst and M.D. Samuel},
  year = {1989},
  doi = {10.2307/2531486},
  url = {https://pubs.usgs.gov/publication/1003853},
  note = {Source identifier: 1003853}
}