@misc{indiciae86c7b8a939c1,
  title = {U.S. Geological Survey coal resource assessment},
  author = {S.S. Crowley and John R. SanFilipo and Peter D. Warwick and S.J. Law and Claire E. Aubourg},
  year = {1999},
  url = {https://pubs.usgs.gov/publication/70195484},
  note = {Source identifier: 70195484}
}