@misc{indiciae13117b6c8feb,
  title = {Coal resource occurrence and coal development potential maps of the Hammond Draw Quadrangle, Rosebud County, Montana},
  author = {Colorado School of Mines Research Institute},
  year = {1979},
  doi = {10.3133/ofr7911},
  url = {https://pubs.usgs.gov/publication/ofr7911},
  note = {Source identifier: ofr7911}
}