@misc{indiciae216da1102515,
  title = {Evaluation of regional ground-water quality in relation to land use; US Geological Survey Toxic Waste--Ground-Water Contamination Program},
  author = {D.R. Helsel and S.E. Ragone},
  year = {1984},
  doi = {10.3133/wri844217},
  url = {https://pubs.usgs.gov/publication/wri844217},
  note = {Source identifier: wri844217}
}