@misc{indiciae3d918756c07a,
  title = {Magnetic surveys in the Hajrah-Hamdah area, including a ground survey of the Hajr ancient mine, Kingdom of Saudi Arabia},
  author = {H. Richard Blank and Maher A. Bazzari},
  year = {1981},
  doi = {10.3133/ofr811216},
  url = {https://pubs.usgs.gov/publication/ofr811216},
  note = {Source identifier: ofr811216}
}