@misc{indiciae4e7339546cc2,
  title = {Population trends of Black Terns from the North American Breeding Bird Survey, 1966-1996},
  author = {B.G. Peterjohn and J.R. Sauer},
  year = {1997},
  url = {https://pubs.usgs.gov/publication/70019158},
  note = {Source identifier: 70019158}
}