@misc{indiciaeae21c319468e,
  title = {Coal resource occurrence and coal development potential maps of the Olive quadrangle, Powder River County, Montana},
  author = {Colorado School of Mines Research Institute},
  year = {1979},
  doi = {10.3133/ofr7995},
  url = {https://pubs.usgs.gov/publication/ofr7995},
  note = {Source identifier: ofr7995}
}