@misc{indiciaecaa7808055cb,
  title = {Geographic map of the central Persian Gulf quadrangle, Kingdom of Saudi Arabia},
  author = {Richard A. Bramkamp and Leon F. Ramirez},
  year = {1959},
  doi = {10.3133/i209b},
  url = {https://pubs.usgs.gov/publication/i209B},
  note = {Source identifier: i209B}
}