@misc{indiciaef841d52d4f40,
  title = {The Coalwood coal field, Powder River County, Montana},
  author = {Robert P. Bryson},
  year = {1952},
  doi = {10.3133/b973b},
  url = {https://pubs.usgs.gov/publication/b973B},
  note = {Source identifier: b973B}
}