@misc{indiciae75459946b64b,
  title = {Total-count gamma radiation map of the Harper quadrangle, Liberia},
  author = {John Charles Behrendt and Cletus S. Wotorson},
  year = {1971},
  doi = {10.3133/ofr7132},
  url = {https://pubs.usgs.gov/publication/ofr7132},
  note = {Source identifier: ofr7132}
}