@misc{indiciae909a679a95f9,
  title = {Scintillation spectrometer II: simultaneous measurement of uranium, thorium and potassium in common rocks},
  author = {Patrick M. Hurley},
  year = {1955},
  doi = {10.3133/tei522},
  url = {https://pubs.usgs.gov/publication/tei522},
  note = {Source identifier: tei522}
}