@misc{indiciae2582b64116fe,
  title = {Geologic map of the Buchanan Quadrangle, Liberia},
  author = {R. G. Tysdal},
  year = {1977},
  doi = {10.3133/i778d},
  url = {https://pubs.usgs.gov/publication/i778D},
  note = {Source identifier: i778D}
}