@misc{indiciaecab44db7f135,
  title = {Coal resources of Wyoming},
  author = {Henry L. Berryhill and Donald M. Brown and Andrew Brown and Dorothy A. Taylor},
  year = {1950},
  doi = {10.3133/cir81},
  url = {https://pubs.usgs.gov/publication/cir81},
  note = {Source identifier: cir81}
}