@misc{indiciae8b550bd4d445,
  title = {Changes in chloride concentration in water from municipal wells that tap aquifers in rocks of Cambrian and Ordovician age in northeastern Illinois, 1915–84},
  author = {G. O. Balding},
  year = {1991},
  doi = {10.3133/wri904116},
  url = {https://pubs.usgs.gov/publication/wri904116},
  note = {Source identifier: wri904116}
}