@misc{indiciae893241a77ffe,
  title = {Quality of rivers of the United States, 1974 water year: based on the National Stream Quality Accounting Network (NASQAN)},
  author = {Richard O. Hawkinson and John F. Ficke and L.G. Saindon},
  year = {1977},
  doi = {10.3133/ofr77151},
  url = {https://pubs.usgs.gov/publication/ofr77151},
  note = {Source identifier: ofr77151}
}