@misc{indiciae1cc5511d1ece,
  title = {Geologic map of the Bar H area, Slim Buttes, Harding County, South Dakota},
  author = {H. D. Zeller},
  year = {1955},
  doi = {10.3133/coal37},
  url = {https://pubs.usgs.gov/publication/coal37},
  note = {Source identifier: coal37}
}