@misc{indiciae53a584b228f5,
  title = {Geologic radon potential of EPA Region 3: Delaware, Maryland, Pennsylvania, Virginia, and West Virginia},
  year = {1993},
  doi = {10.3133/ofr93292c},
  url = {https://pubs.usgs.gov/publication/ofr93292C},
  note = {Source identifier: ofr93292C}
}