@misc{indiciae31f7d46ef8bf,
  title = {Purple martin population trends from the North American Breeding Bird Survey, 1966-1994},
  author = {B.G. Peterjohn and J.R. Sauer},
  year = {1995},
  url = {https://pubs.usgs.gov/publication/5223302},
  note = {Source identifier: 5223302}
}