@misc{indiciae81d7d00a9c4e,
  title = {Geology of the central Persian Gulf quadrangle, Kingdom of Saudi Arabia},
  author = {Richard A. Bramkamp and Leon F. Ramirez},
  year = {1961},
  doi = {10.3133/i209a},
  url = {https://pubs.usgs.gov/publication/i209A},
  note = {Source identifier: i209A}
}