@misc{indiciae37af63a05eba,
  title = {Quality of rivers of the United States, 1975 water year; based on the National Stream Quality Accounting Network (NASQAN)},
  author = {John C. Briggs and John F. Ficke},
  year = {1977},
  doi = {10.3133/ofr78200},
  url = {https://pubs.usgs.gov/publication/ofr78200},
  note = {Source identifier: ofr78200}
}