@misc{indiciae5ad42a45d9ea,
  title = {Reconnaissance geology of the Jabal 'Afaf Quadrangle, sheet 20/40 D, Kingdom of Saudi Arabia},
  author = {Donald G. Hadley and Robert Joseph Fleck},
  year = {1979},
  doi = {10.3133/ofr80129},
  url = {https://pubs.usgs.gov/publication/ofr80129},
  note = {Source identifier: ofr80129}
}