@misc{indiciaeacd44c4ed52d,
  title = {Bouguer anomaly map of the Monrovia quadrangle, Liberia},
  author = {John Charles Behrendt and Cletus S. Wotorson},
  year = {1971},
  doi = {10.3133/ofr7128},
  url = {https://pubs.usgs.gov/publication/ofr7128},
  note = {Source identifier: ofr7128}
}