@misc{indiciae909d63e3f23f,
  title = {Geology of the southern Tuwayq quadrangle, Kingdom of Saudi Arabia},
  author = {Richard A. Bramkamp and Ruel D. Gierhart and Glen F. Brown and Roy O. Jackson},
  year = {1956},
  doi = {10.3133/i212a},
  url = {https://pubs.usgs.gov/publication/i212A},
  note = {Source identifier: i212A}
}