@misc{indiciae95820f6c9e35,
  title = {Geology and mineral deposits of the Jabal ash Shumta quadrangle, Kingdom of Saudi Arabia},
  author = {C. L. Hummel and Abdullah O. Ankary},
  year = {1972},
  doi = {10.3133/ofr72177},
  url = {https://pubs.usgs.gov/publication/ofr72177},
  note = {Source identifier: ofr72177}
}