@misc{indiciae0291eddf94f9,
  title = {Preliminary report on the ancient mines and mineral occurrences in northeastern Hijaz quadrangle 205 and the southwest part of Wadi Ar Rimah quadrangle 206, Saudi Arabia},
  author = {C. L. Hummel and Abdullah Ankary and Hashim Hakim},
  year = {1970},
  doi = {10.3133/ofr70168},
  url = {https://pubs.usgs.gov/publication/ofr70168},
  note = {Source identifier: ofr70168}
}