@misc{indiciae106ac842fd6c,
  title = {Mineral reconnaissance of the Wadi al 'Aya quadrangle},
  author = {Robert Francis Johnson and Virgil A. Trent},
  year = {1968},
  doi = {10.3133/ofr68151},
  url = {https://pubs.usgs.gov/publication/ofr68151},
  note = {Source identifier: ofr68151}
}