@misc{indiciaeb1470f6d1571,
  title = {Winter bird population studies and project prairie birds for surveying grassland birds},
  author = {D.J. Twedt and P.B. Hamel and M.S. Woodrey},
  year = {2008},
  url = {https://pubs.usgs.gov/publication/5224857},
  note = {Source identifier: 5224857}
}