@misc{indiciaea7c98c7d5570,
  title = {Aerial gamma-ray, Landsat TM, and digital elevation data, Big Bend area, Texas},
  author = {Joseph S. Duval},
  year = {2005},
  doi = {10.3133/ofr20051371},
  url = {https://pubs.usgs.gov/publication/ofr20051371},
  note = {Source identifier: ofr20051371}
}