@misc{indiciaec20a0f28c23a,
  title = {Mineral investigations in the Bir Al Bayda-Al 'Ula area Saudi Arabia},
  author = {Virgil A. Trent},
  year = {1970},
  doi = {10.3133/ofr70328},
  url = {https://pubs.usgs.gov/publication/ofr70328},
  note = {Source identifier: ofr70328}
}