@misc{indiciaee872fde7141a,
  title = {Wading birds as biological indicators: 1975 colony survey},
  author = {Thomas W. Custer and Ronald G. Osborn},
  year = {1977},
  url = {https://pubs.usgs.gov/publication/fwsobs77\_64},
  note = {Source identifier: fwsobs77\_64}
}