@misc{indiciaeeb197aa310c4,
  title = {Herons and egrets as proposed indicators of estuarine contamination in the United States},
  author = {T. W. Custer and Barnett A. Rattner and H. M. Ohlendorf and M. J. Melancon},
  year = {1991},
  url = {https://pubs.usgs.gov/publication/5210682},
  note = {Source identifier: 5210682}
}