@misc{indiciaec8d4358de826,
  title = {Geology and mineral deposits of the Wadi an Nuqumi quadrangle, Kingdom of Saudi Arabia},
  author = {C. L. Hummel},
  year = {1972},
  doi = {10.3133/ofr72176},
  url = {https://pubs.usgs.gov/publication/ofr72176},
  note = {Source identifier: ofr72176}
}