@misc{indiciae9728ef323c4a,
  title = {Total-count gamma radiation map of the Voinjama Quadrangle, Liberia},
  author = {John C. Behrendt and C.S. Wotorson},
  year = {1974},
  doi = {10.3133/i771c},
  url = {https://pubs.usgs.gov/publication/i771C},
  note = {Source identifier: i771C}
}