@misc{indiciae1c5ffcc29809,
  title = {Geologic map of Ragged Mountain coal area, Gunnison County, Colorado},
  author = {George Henry Horn and J.S. Adair},
  year = {1959},
  doi = {10.3133/ofr5961},
  url = {https://pubs.usgs.gov/publication/ofr5961},
  note = {Source identifier: ofr5961}
}