@misc{indiciaefe5cf254915f,
  title = {Coal Extraction - Environmental Prediction},
  author = {C. Blaine Cecil and Susan J. Tewalt},
  year = {2002},
  doi = {10.3133/fs07302},
  url = {https://pubs.usgs.gov/publication/fs07302},
  note = {Source identifier: fs07302}
}