@misc{indiciae10593c2b2b52,
  title = {Mineral reconnaissance of the Bir al Bayda' quadrangle, northwest Hijaz, Saudi Arabia},
  author = {Robert Francis Johnson and Virgil A. Trent},
  year = {1968},
  doi = {10.3133/ofr68149},
  url = {https://pubs.usgs.gov/publication/ofr68149},
  note = {Source identifier: ofr68149}
}