@misc{indiciae348b9d523b4b,
  title = {Geologic map of the Gbanka Quadrangle, Liberia},
  author = {E. R. Force and J.D.N. Dunbar},
  year = {1977},
  doi = {10.3133/i776d},
  url = {https://pubs.usgs.gov/publication/i776D},
  note = {Source identifier: i776D}
}