@misc{indiciaed241c9723c1f,
  title = {Effects of radon in drill holes on gamma-ray logs},
  author = {Lowell Sinclair Hilpert and Carl Maurice Bunker},
  year = {1957},
  doi = {10.2113/gsecongeo.52.4.438},
  url = {https://pubs.usgs.gov/publication/70216350},
  note = {Source identifier: 70216350}
}