@misc{indiciae75e9e3dad570,
  title = {Coal quality and resources in the U.S. Gulf Coastal Plain},
  author = {Peter D. Warwick and John R. SanFilipo and Jason C. Willett},
  year = {2001},
  url = {https://pubs.usgs.gov/publication/70195472},
  note = {Source identifier: 70195472}
}