@misc{indiciae021a07a08587,
  title = {Radon soil-gas survey in Prince Georges County, Maryland},
  author = {G.M. Reimer},
  year = {1988},
  doi = {10.3133/ofr8852},
  url = {https://pubs.usgs.gov/publication/ofr8852},
  note = {Source identifier: ofr8852}
}