@misc{indiciae9395a5905471,
  title = {Dissolved-solids concentrations and primary water types, Gulf Coast aquifer systems, south-central United States},
  author = {Robert A. Pettijohn},
  year = {1988},
  doi = {10.3133/ha706},
  url = {https://pubs.usgs.gov/publication/ha706},
  note = {Source identifier: ha706}
}