@misc{indiciaef89b32de0472,
  title = {The U.S. Geological Survey National Coal Resource Assessment},
  author = {Brenda S. Pierce},
  year = {2001},
  doi = {10.3133/fs02001},
  url = {https://pubs.usgs.gov/publication/fs02001},
  note = {Source identifier: fs02001}
}