@misc{indiciaeb48bd962775d,
  title = {Total coal movement, 1974},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1977},
  doi = {10.3133/32555},
  url = {https://pubs.usgs.gov/publication/32555},
  note = {Source identifier: 32555}
}