@misc{indiciaeb647aa4df404,
  title = {Geology of the Rifle Gap coal district, Garfield County, Colorado},
  author = {George Henry Horn and W.C. Gere},
  year = {1959},
  doi = {10.3133/ofr5963},
  url = {https://pubs.usgs.gov/publication/ofr5963},
  note = {Source identifier: ofr5963}
}