@misc{indiciae6ead58db9684,
  title = {Summary of results of the coal resource occurrence and coal development potential mapping program in part of the Powder River basin, Montana and Wyoming},
  author = {V. A. Trent},
  year = {1985},
  doi = {10.3133/ofr85621},
  url = {https://pubs.usgs.gov/publication/ofr85621},
  note = {Source identifier: ofr85621}
}