@misc{indiciaead682d228148,
  title = {Distribution, thickness, overburden, and structure contour maps of potentially recoverable lignite beds in the eastern part of the Fort Peck Indian Reservation, Montana},
  author = {John K. Hardie and Harold H. Arndt},
  year = {1987},
  doi = {10.3133/ofr87674},
  url = {https://pubs.usgs.gov/publication/ofr87674},
  note = {Source identifier: ofr87674}
}