@misc{indiciae6b40fd1b24df,
  title = {Radon-222 in the ground water of Chester County, Pennsylvania},
  author = {Lisa A. Senior},
  year = {1998},
  doi = {10.3133/wri984169},
  url = {https://pubs.usgs.gov/publication/wri984169},
  note = {Source identifier: wri984169}
}