@misc{indiciae3a52de3da3ff,
  title = {Geology of the northeastern Rub' Al Khali quadrangle, Kingdom of Saudi Arabia},
  author = {Richard A. Bramkamp and Leon F. Ramirez},
  year = {1961},
  doi = {10.3133/i214a},
  url = {https://pubs.usgs.gov/publication/i214A},
  note = {Source identifier: i214A}
}