@misc{indiciae1c7c9f49c7c4,
  title = {Coal resource regions in the conterminous United States},
  author = {John K. Tully},
  year = {1996},
  doi = {10.3133/ofr96279},
  url = {https://pubs.usgs.gov/publication/ofr96279},
  note = {Source identifier: ofr96279}
}