@misc{indiciae21f6d3560cfa,
  title = {Federal Coal in the United States: A Digital Database of Coal Ownership Status},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1998},
  doi = {10.3133/fs01298},
  url = {https://pubs.usgs.gov/publication/fs01298},
  note = {Source identifier: fs01298}
}