@misc{indiciaec9d0ec5c554a,
  title = {Total hardness of water from the upper permeable zone of the Tertiary limestone aquifer system, southeastern United States},
  author = {Craig L. Sprinkle},
  year = {1982},
  doi = {10.3133/wri811102},
  url = {https://pubs.usgs.gov/publication/wri811102},
  note = {Source identifier: wri811102}
}