@misc{indiciaeddfc32111517,
  title = {Resources on federal lands for five coal beds in the northern and central Appalachian Basin coal regions},
  author = {Susan J. Tewalt},
  year = {2001},
  doi = {10.3133/ofr01178},
  url = {https://pubs.usgs.gov/publication/ofr01178},
  note = {Source identifier: ofr01178}
}