@misc{indiciae4a708cd05d28,
  title = {Considerations for monitoring raptor population trends based on counts of migrants},
  author = {K. Titus and M.R. Fuller and J.L. Ruos},
  year = {1989},
  url = {https://pubs.usgs.gov/publication/5210406},
  note = {Source identifier: 5210406}
}