@misc{indiciae74f32fb4c3ff,
  title = {Geologic Map of the Pine Mountain quadrangle, Colorado},
  author = {Fred W. Cater},
  year = {1955},
  doi = {10.3133/gq60},
  url = {https://pubs.usgs.gov/publication/gq60},
  note = {Source identifier: gq60}
}