@misc{indiciaeb732f41b80b0,
  title = {Geographic map of the Zwedru Quadrangle, Liberia},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey and Liberian Geological Survey},
  year = {1973},
  doi = {10.3133/i777a},
  url = {https://pubs.usgs.gov/publication/i777A},
  note = {Source identifier: i777A}
}