@misc{indiciae97c14fb68734,
  title = {The 1992 and 1993 summary of the North American Breeding Bird Survey},
  author = {B.G. Peterjohn and J.R. Sauer and W.A. Link},
  year = {1994},
  url = {https://pubs.usgs.gov/publication/5222713},
  note = {Source identifier: 5222713}
}