@misc{indiciae197c615b0a90,
  title = {Geologic radon potential of EPA Region 9; Arizona, California, Hawaii, and Nevada},
  year = {1993},
  doi = {10.3133/ofr93292i},
  url = {https://pubs.usgs.gov/publication/ofr93292I},
  note = {Source identifier: ofr93292I}
}