@misc{indiciae79574b2e7cf5,
  title = {Total-count gamma radiation map of the Gbanka quadrangle, Liberia},
  author = {John Charles Behrendt and Cletus B. Wotorson},
  year = {1971},
  doi = {10.3133/ofr7131},
  url = {https://pubs.usgs.gov/publication/ofr7131},
  note = {Source identifier: ofr7131}
}