@misc{indiciae829e4aa9caba,
  title = {Maps showing coal-split boundaries, isopachs of coal splits, coal resources, and coal quality– Mammoth coal bed, Paleocene Tongue River Member of the Fort Union Formation, Bull Mountain coal field, south-central Montana},
  author = {Carol Waite Connor},
  year = {1989},
  doi = {10.3133/coal126b},
  url = {https://pubs.usgs.gov/publication/coal126B},
  note = {Source identifier: coal126B}
}