@misc{indiciaed99f9e232237,
  title = {Effects of radon in drill holes on gamma-ray logs},
  author = {L.S. Hilpert and Carl Maurice Bunker},
  year = {1957},
  doi = {10.3133/tei553},
  url = {https://pubs.usgs.gov/publication/tei553},
  note = {Source identifier: tei553}
}