@misc{indiciaed0398066fd99,
  title = {Coal-quality information from the eastern United States},
  author = {Virgil A. Trent},
  year = {1980},
  doi = {10.3133/mf1190},
  url = {https://pubs.usgs.gov/publication/mf1190},
  note = {Source identifier: mf1190}
}