@misc{indiciae1baab535211f,
  title = {Geologic map of the southern Najd quadrangle, Kingdom of Saudi Arabia},
  author = {Roy O. Jackson and R.G. Bogue and Glen F. Brown and Ruel D. Gierhart},
  year = {1963},
  doi = {10.3133/i211a},
  url = {https://pubs.usgs.gov/publication/i211A},
  note = {Source identifier: i211A}
}