@misc{indiciae777e3d5e3035,
  title = {Map showing free-air gravity anomalies off the southern coast of west-central Africa Liberia to Ghana},
  author = {D. W. Folger and B.J. Irwin and J.R. McCullough and R.W. Rowland and C. F. Polloni},
  year = {1990},
  doi = {10.3133/mf2098e},
  url = {https://pubs.usgs.gov/publication/mf2098E},
  note = {Source identifier: mf2098E}
}