@misc{indiciaeda507152afff,
  title = {A study of trends in dissolved oxygen and fecal coliform bacteria at NASQAN stations},
  author = {Richard A. Smith and Richard B. Alexander},
  year = {1982},
  doi = {10.3133/ofr821019},
  url = {https://pubs.usgs.gov/publication/ofr821019},
  note = {Source identifier: ofr821019}
}