@misc{indiciae1716d3b0fe84,
  title = {Tritium as an indicator of modern, mixed, and premodern groundwater age},
  author = {Bruce D. Lindsey and Bryant C. Jurgens and Kenneth Belitz},
  year = {2019},
  doi = {10.3133/sir20195090},
  url = {https://pubs.usgs.gov/publication/sir20195090},
  note = {Source identifier: sir20195090}
}