@misc{indiciae65e58abe37ff,
  title = {Structure, coal thickness, and overburden thickness of the Knobloch coal resource unit, Birney area, Big Horn, Rosebud, and Powder River Counties, Montana},
  author = {William C. Culbertson and Herb I. Saperstone},
  year = {1987},
  doi = {10.3133/coal112},
  url = {https://pubs.usgs.gov/publication/coal112},
  note = {Source identifier: coal112}
}