@misc{indiciae0ba25cbaeae0,
  title = {A direct correlation among indoor Rn, soil gas Rn and geology in the Reading Prong near Boyertown, Pennsylvania},
  author = {G.M. Reimer and L.C.S. Gundersen},
  year = {1989},
  url = {https://pubs.usgs.gov/publication/70015771},
  note = {Source identifier: 70015771}
}