@misc{indiciaea11e0508126c,
  title = {Estimates of avian population trends from the North American Breeding Bird Survey},
  author = {P.H. Geissler and B.R. Noon},
  year = {1981},
  url = {https://pubs.usgs.gov/publication/5210275},
  note = {Source identifier: 5210275}
}