@misc{indiciae70538fb0ba70,
  title = {Coal resources of the United States (a progress report, October 1, 1953)},
  author = {Paul Averitt and Louise R. Berryhill and Dorothy A. Taylor},
  year = {1953},
  doi = {10.3133/cir293},
  url = {https://pubs.usgs.gov/publication/cir293},
  note = {Source identifier: cir293}
}