@misc{indiciaee502d9e54c80,
  title = {Geologic and coal outcrop map of the Madrid quadrangle, Las Animas, Colorado},
  author = {Walter Danilchik},
  year = {1979},
  doi = {10.3133/ofr79377},
  url = {https://pubs.usgs.gov/publication/ofr79377},
  note = {Source identifier: ofr79377}
}