@misc{indiciaeaceb0f67aba4,
  title = {Coal resource occurrence and coal development potential maps of the Birney Quadrangle, Rosebud County, Montana},
  author = {W. J. Mapel and B. K. Martin},
  year = {1978},
  doi = {10.3133/ofr7830},
  url = {https://pubs.usgs.gov/publication/ofr7830},
  note = {Source identifier: ofr7830}
}