@misc{indiciaef31421f540b4,
  title = {Annotated bibliography of gamma-ray methods applied to gold exploration},
  author = {D.B. Hoover and H. A. Pierce},
  year = {1990},
  doi = {10.3133/ofr90203},
  url = {https://pubs.usgs.gov/publication/ofr90203},
  note = {Source identifier: ofr90203}
}