@misc{indiciae94ab1b818071,
  title = {A statistical summary of data from the U.S. Geological Survey's national water quality networks},
  author = {R. A. Smith and R. B. Alexander},
  year = {1983},
  doi = {10.3133/ofr83533},
  url = {https://pubs.usgs.gov/publication/ofr83533},
  note = {Source identifier: ofr83533}
}