@misc{indiciae583e571e7b60,
  title = {Geologic Map of the Bull Canyon quadrangle, Colorado},
  author = {Fred W. Cater},
  year = {1954},
  doi = {10.3133/gq33},
  url = {https://pubs.usgs.gov/publication/gq33},
  note = {Source identifier: gq33}
}