@misc{indiciae0c1b975b7b70,
  title = {Interpretation of coal quality data : the inorganic constituents, with comments on the quality of coal from the Sonda Coal Field, Sindh Province, Pakistan},
  author = {Robert B. Finkelman and C.L. Oman},
  year = {1995},
  doi = {10.3133/ofr93591},
  url = {https://pubs.usgs.gov/publication/ofr93591},
  note = {Source identifier: ofr93591}
}