@misc{indiciae712fe32e84b1,
  title = {Radon in ground water of western Montana},
  author = {David W. Clark and D.W. Briar},
  year = {1993},
  doi = {10.3133/ofr9364},
  url = {https://pubs.usgs.gov/publication/ofr9364},
  note = {Source identifier: ofr9364}
}