@misc{indiciaeaca418988c9b,
  title = {Coal resource occurrence and coal development potential maps of the Spring Creek Ranch quadrangle, Big Horn County, Montana},
  author = {Colorado School of Mines},
  year = {1979},
  doi = {10.3133/ofr79777},
  url = {https://pubs.usgs.gov/publication/ofr79777},
  note = {Source identifier: ofr79777}
}