@misc{indiciae5e98818e4034,
  title = {Geochemical interpretations of groundwater flow systems},
  author = {William Back and Bruce B. Hanshaw},
  year = {2007},
  doi = {10.1111/j.1752-1688.1971.tb05021.x},
  url = {https://pubs.usgs.gov/publication/70227432},
  note = {Source identifier: 70227432}
}