@misc{indiciae30e54b8f4b8a,
  title = {Utilization of gamma-ray logs by the U.S. Geological Survey, 1949-1953},
  author = {Kenneth Granville Bell and V.C. Rhoden and R.L. McDonald and C. M. Bunker},
  year = {1961},
  doi = {10.3133/ofr6121},
  url = {https://pubs.usgs.gov/publication/ofr6121},
  note = {Source identifier: ofr6121}
}