@misc{indiciae201a31504c80,
  title = {Geologic map of the Maroon Bells quadrangle, Pitkin and Gunnison Counties, Colorado},
  author = {Bruce Bryant},
  year = {1969},
  doi = {10.3133/gq788},
  url = {https://pubs.usgs.gov/publication/gq788},
  note = {Source identifier: gq788}
}