@misc{indiciaefabc4a0308ba,
  title = {Coking-coal deposits of the western United States},
  author = {Paul Averitt},
  year = {1966},
  doi = {10.3133/b1222g},
  url = {https://pubs.usgs.gov/publication/b1222G},
  note = {Source identifier: b1222G}
}