@misc{indiciae20a2bf3034a6,
  title = {Fluorine in a closed drainage basin, Saguache and Alamosa Counties, Colorado},
  author = {Ralph Erskine Van Alstine and Frederick Otto Simon},
  year = {1982},
  doi = {10.3133/b1533},
  url = {https://pubs.usgs.gov/publication/b1533},
  note = {Source identifier: b1533}
}