@misc{indiciae58f646f7715b,
  title = {Coal resource occurrence and coal development potential maps of the Fourmile Creek Quadrangle, Custer County, Montana},
  author = {Colorado School of Mines Research Institute},
  year = {1978},
  doi = {10.3133/ofr78640},
  url = {https://pubs.usgs.gov/publication/ofr78640},
  note = {Source identifier: ofr78640}
}