@misc{indiciae084d5d475a47,
  title = {Map showing radon potential of rocks and soils in Montgomery County, Maryland},
  author = {L.C. Gundersen and G.M. Reimer and C.R. Wiggs and C. A. Rice},
  year = {1988},
  doi = {10.3133/mf2043},
  url = {https://pubs.usgs.gov/publication/mf2043},
  note = {Source identifier: mf2043}
}