@misc{indiciae28c6fea29613,
  title = {The mass balance approach: application to interpreting the chemical evolution of hydrologic systems},
  author = {Niel Plummer and W. Back},
  year = {1980},
  doi = {10.2475/ajs.280.2.130},
  url = {https://pubs.usgs.gov/publication/70012188},
  note = {Source identifier: 70012188}
}