@misc{indiciae7f140639994a,
  title = {Coal resources of the Sonda coal field, Sindh Province, Pakistan},
  author = {R. E. Thomas and Khan M. Riaz and Khan S. Ahmed},
  year = {1993},
  doi = {10.1016/0166-5162(93)90047-e},
  url = {https://pubs.usgs.gov/publication/70017386},
  note = {Source identifier: 70017386}
}