@misc{indiciaed478a16fe14e,
  title = {Geologic map of the Monrovia Quadrangle, Liberia},
  author = {Charles H. Thorman},
  year = {1974},
  doi = {10.3133/ofr74305},
  url = {https://pubs.usgs.gov/publication/ofr74305},
  note = {Source identifier: ofr74305}
}