@misc{indiciae418bb3c23ff2,
  title = {Map showing isopachs of coal and overburden of the Canyon Coal Bed, Birney 30' x 60' Quadrangle, Big Horn, Rosebud, and Powder River counties, Montana},
  author = {Laura N. Robinson and William C. Culbertson},
  year = {1984},
  doi = {10.3133/coal96b},
  url = {https://pubs.usgs.gov/publication/coal96B},
  note = {Source identifier: coal96B}
}