@misc{indiciae76fa9b7dae02,
  title = {Analytical data for bituminous coals and associated rocks from Arkansas, Iowa, Kansas, Missouri, Nebraska, and Oklahoma},
  author = {S.J. Tewalt and R. B. Finkelman},
  year = {1990},
  doi = {10.3133/ofr90669},
  url = {https://pubs.usgs.gov/publication/ofr90669},
  note = {Source identifier: ofr90669}
}