@misc{indiciae63c9a0b1a533,
  title = {Geologic map of Liberia},
  author = {R. G. Tysdal and C.H. Thorman},
  year = {1983},
  doi = {10.3133/i1480},
  url = {https://pubs.usgs.gov/publication/i1480},
  note = {Source identifier: i1480}
}