@misc{indiciae0545b4008a9e,
  title = {Preliminary investigation of cement materials in the Taif area, Saudi Arabia},
  author = {Conrad Martin},
  year = {1970},
  doi = {10.3133/ofr70216},
  url = {https://pubs.usgs.gov/publication/ofr70216},
  note = {Source identifier: ofr70216}
}