@misc{indiciae33f3f790f646,
  title = {Geology and coal resources of the Carbondale area, Garfield, Pitkin, and Gunnison Counties, Colorado},
  author = {John R. Donnell},
  year = {1962},
  doi = {10.3133/ofr6238},
  url = {https://pubs.usgs.gov/publication/ofr6238},
  note = {Source identifier: ofr6238}
}