@misc{indiciae5135c327889d,
  title = {An evaluation of the Christmas Bird Count for monitoring population trends of selected species},
  author = {G.S. Butcher and M.R. Fuller and L.S. McAllister and P.H. Geissler},
  year = {1990},
  url = {https://pubs.usgs.gov/publication/5222405},
  note = {Source identifier: 5222405}
}