@misc{indiciae1b4e91a0c701,
  title = {Preliminary geologic map of region east of Sa'dah, Yemen Arab Republic, Landsat-1 image No. 1117-06553},
  author = {Maurice J. Grolier and William C. Overstreet},
  year = {1976},
  doi = {10.3133/ofr76740},
  url = {https://pubs.usgs.gov/publication/ofr76740},
  note = {Source identifier: ofr76740}
}