@misc{indiciae85c509fe29cd,
  title = {Coal resource assessments in the northern and central Appalachian coal region},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1999},
  doi = {10.3133/fs11599},
  url = {https://pubs.usgs.gov/publication/fs11599},
  note = {Source identifier: fs11599}
}