@misc{indiciaec0b29f0ac386,
  title = {Coal geology of the Girard area, Richland and Roosevelt counties, Montana},
  author = {Mary Alice Spencer},
  year = {1980},
  doi = {10.3133/ofr80213},
  url = {https://pubs.usgs.gov/publication/ofr80213},
  note = {Source identifier: ofr80213}
}