@misc{indiciae45e3dfb3b861,
  title = {Coal resource occurrence map and coal development potential of the Padlock Ranch quadrangle, Big Horn County, Montana},
  author = {Colorado School of Mines Research Institute},
  year = {1978},
  doi = {10.3133/ofr78633},
  url = {https://pubs.usgs.gov/publication/ofr78633},
  note = {Source identifier: ofr78633}
}