@misc{indiciaeae47ffd68ec4,
  title = {Preliminary geologic map of North Yemen, region north of San'a, Yemen Arab Republic Landsat-1 image No. 1189-06555},
  author = {Maurice J. Grolier and William C. Overstreet},
  year = {1976},
  doi = {10.3133/ofr76741},
  url = {https://pubs.usgs.gov/publication/ofr76741},
  note = {Source identifier: ofr76741}
}