@misc{indiciaea3f5f12ddd24,
  title = {North American Breeding Bird Survey annual summary 1990-1991},
  author = {B.G. Peterjohn and J.R. Sauer},
  year = {1993},
  url = {https://pubs.usgs.gov/publication/5222886},
  note = {Source identifier: 5222886}
}