@misc{indiciaed4ebcd88c960,
  title = {Simple Bouguer gravity map of the Monrovia Quadrangle, Liberia},
  author = {John C. Behrendt and C.S. Wotorson},
  year = {1974},
  doi = {10.3133/i775e},
  url = {https://pubs.usgs.gov/publication/i775E},
  note = {Source identifier: i775E}
}