@misc{indiciaee4b90223973b,
  title = {Fluoride occurrence in United States groundwater},
  author = {Peter B. McMahon and Craig J. Brown and Tyler D. Johnson and Kenneth Belitz and Bruce D. Lindsey},
  year = {2020},
  doi = {10.1016/j.scitotenv.2020.139217},
  url = {https://pubs.usgs.gov/publication/70210175},
  note = {Source identifier: 70210175}
}