@misc{indiciae02141492b94d,
  title = {Sample preparation and gamma-ray spectrometer operation for determining natural radioelement contents in rocks at the U.S. Geological Survey in Denver, Colorado},
  author = {Charles A. Bush},
  year = {1981},
  doi = {10.3133/ofr811308},
  url = {https://pubs.usgs.gov/publication/ofr811308},
  note = {Source identifier: ofr811308}
}