@misc{indiciae3c3e61c55373,
  title = {Preliminary map of the conterminous United States showing depth to and quality of shallowest ground water containing more than 1,000 parts per million dissolved solids},
  author = {John Henry Frederick Feth},
  year = {1965},
  doi = {10.3133/ha199},
  url = {https://pubs.usgs.gov/publication/ha199},
  note = {Source identifier: ha199}
}