@misc{indiciaef728efcd7e64,
  title = {Radon in ground water in Guilford County, North Carolina},
  author = {Timothy B. Spruill and Janie B. Williams and David R. Galeone and Douglas A. Harned},
  year = {1997},
  doi = {10.3133/fs14797},
  url = {https://pubs.usgs.gov/publication/fs14797},
  note = {Source identifier: fs14797}
}