@misc{indiciae0cbf16d25a35,
  title = {Geologic radon potential of EPA Region 8: Colorado, Montana, North Dakota, South Dakota, Utah, and Wyoming},
  year = {1993},
  doi = {10.3133/ofr93292h},
  url = {https://pubs.usgs.gov/publication/ofr93292H},
  note = {Source identifier: ofr93292H}
}