@misc{indiciae7524360ad650,
  title = {Geology of the Harper Quadrangle, Liberia},
  author = {M. R. Brock and A.H. Chidester and M.G.W. Baker},
  year = {1974},
  doi = {10.3133/ofr74310},
  url = {https://pubs.usgs.gov/publication/ofr74310},
  note = {Source identifier: ofr74310}
}