@misc{indiciaea745dff4a4cf,
  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},
  doi = {10.2307/1521612},
  url = {https://pubs.usgs.gov/publication/5223499},
  note = {Source identifier: 5223499}
}