@misc{indiciaeffa0bd8f4fa7,
  title = {National Coal Quality Inventory (NaCQI) and U.S. Geological Survey Coal Quality Databases},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1999},
  doi = {10.3133/fs12099},
  url = {https://pubs.usgs.gov/publication/fs12099},
  note = {Source identifier: fs12099}
}