@misc{indiciae19c546bffee4,
  title = {Coal resource occurrence and coal development potential maps of the Black Spring Quadrangle, Rosebud and Big Horn Counties, Montana},
  author = {Colorado School of Mines Research Institute},
  year = {1979},
  doi = {10.3133/ofr793},
  url = {https://pubs.usgs.gov/publication/ofr793},
  note = {Source identifier: ofr793}
}