@misc{indiciae2f329c11033b,
  title = {Aeromagnetic map of the Harper Quadrangle, Liberia},
  author = {John C. Behrendt and C.S. Wotorson},
  year = {1974},
  doi = {10.3133/i780b},
  url = {https://pubs.usgs.gov/publication/i780B},
  note = {Source identifier: i780B}
}