@misc{indiciae8c0e0c5e59de,
  title = {Calcium carbonate saturation in ground water, from routine analyses},
  author = {William Back},
  year = {1961},
  doi = {10.3133/wsp1535d},
  url = {https://pubs.usgs.gov/publication/wsp1535D},
  note = {Source identifier: wsp1535D}
}