@misc{indiciae4def4c28b91d,
  title = {Calibration constants for the Geodata International, Inc., and Texas Instruments, Inc.: High sensitivity systems used for the ERDA aerial gamma-ray surveys},
  author = {Joseph S. Duval and Karen A. Schulz and James A. Pitkin},
  year = {1977},
  doi = {10.3133/ofr77159},
  url = {https://pubs.usgs.gov/publication/ofr77159},
  note = {Source identifier: ofr77159}
}