@misc{indiciae420129045d1c,
  title = {Total-count gamma radiation map of the Buchanan Quadrangle, Liberia},
  author = {John C. Behrendt and C.S. Wotorson},
  year = {1974},
  doi = {10.3133/i778c},
  url = {https://pubs.usgs.gov/publication/i778C},
  note = {Source identifier: i778C}
}