@misc{indiciaeef42af87f1a7,
  title = {Aerial gamma-ray contour maps of regional surface concentrations of potassium, uranium, and thorium in Nevada},
  author = {J. S. Duval},
  year = {1988},
  doi = {10.3133/gp982},
  url = {https://pubs.usgs.gov/publication/gp982},
  note = {Source identifier: gp982}
}