@misc{indiciae1940f30caaee,
  title = {Reconnaissance geology of the Wadi Sa'diyah Quadrangle (sheet 20/40A), Kingdom of Saudi Arabia},
  author = {K. L. Wier and Donald G. Hadley},
  year = {1975},
  doi = {10.3133/ofr75493},
  url = {https://pubs.usgs.gov/publication/ofr75493},
  note = {Source identifier: ofr75493}
}