@misc{indiciaec28e64388252,
  title = {Colonial bird monitoring: A strategy for regional and national evaluation},
  author = {R.M. Erwin and P.H. Geissler and M.L. Shaffer and D.A. McCrimmon},
  year = {1984},
  url = {https://pubs.usgs.gov/publication/5210358},
  note = {Source identifier: 5210358}
}