@misc{indiciae5c35979b6f5e,
  title = {Preliminary geologic map of the Bull Fork quadrangle, Garfield and Rio Blanco counties, Colorado},
  author = {W. J. Hail},
  year = {1977},
  doi = {10.3133/mf830},
  url = {https://pubs.usgs.gov/publication/mf830},
  note = {Source identifier: mf830}
}