@misc{indiciaee1aec4872a65,
  title = {Index map of 1:250,000-scale quadrangle maps of the Arabian Peninsula},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1981},
  doi = {10.3133/ofr81473},
  url = {https://pubs.usgs.gov/publication/ofr81473},
  note = {Source identifier: ofr81473}
}