@misc{indiciaeef53f428573e,
  title = {Preliminary Bouguer anomaly map of the Monrovia region of Liberia},
  author = {John C. Behrendt and C.S. Wotorson},
  year = {1969},
  doi = {10.3133/ofr6917},
  url = {https://pubs.usgs.gov/publication/ofr6917},
  note = {Source identifier: ofr6917}
}