@misc{indiciae2d92b7a12319,
  title = {Mineral deposits of the northwestern Hijaz quadrangle, Kingdom of Saudi Arabia},
  author = {Robert Francis Johnson and Virgil A. Trent},
  year = {1972},
  doi = {10.3133/ofr72195},
  url = {https://pubs.usgs.gov/publication/ofr72195},
  note = {Source identifier: ofr72195}
}