@misc{indiciae878ff8143461,
  title = {Geologic map of the Monrovia Quadrangle, Liberia},
  author = {C.H. Thorman},
  year = {1977},
  doi = {10.3133/i775d},
  url = {https://pubs.usgs.gov/publication/i775D},
  note = {Source identifier: i775D}
}