@misc{indiciae04dc2465450e,
  title = {Coal deposits of the United States},
  author = {Nelson W. John},
  year = {1987},
  doi = {10.1016/0166-5162(87)90072-3},
  url = {https://pubs.usgs.gov/publication/70014217},
  note = {Source identifier: 70014217}
}