@misc{indiciaeb59a8071e260,
  title = {Total-count gamma radiation map of the Zwedru Quadrangle, Liberia},
  author = {C.S. Wotorson and John C. Behrendt},
  year = {1974},
  doi = {10.3133/i777c},
  url = {https://pubs.usgs.gov/publication/i777C},
  note = {Source identifier: i777C}
}