@misc{indiciae788b5abbcf7b,
  title = {Coal resource occurrence map and coal development potential of the Iron Spring quadrangle, Big Horn and Treasure Counties, Montana},
  author = {Colorado School of Mines Research Institute},
  year = {1978},
  doi = {10.3133/ofr78631},
  url = {https://pubs.usgs.gov/publication/ofr78631},
  note = {Source identifier: ofr78631}
}