@misc{indiciae226b6a00654f,
  title = {Diagrams showing proposed correlation and nomenclature of Eocene and Paleocene coal beds in the Birney 30' x 60' Quadrangle, Big Horn, Rosebud, and Powder River counties, Montana},
  author = {William Craven Culbertson},
  year = {1987},
  doi = {10.3133/coal113},
  url = {https://pubs.usgs.gov/publication/coal113},
  note = {Source identifier: coal113}
}