@misc{indiciae6b4fefdfd905,
  title = {Geologic map of the Iris NW quadrangle, Gunnison and Saguache Counties, Colorado},
  author = {David Carl Hedlund and Jerry Chipman Olson},
  year = {1974},
  doi = {10.3133/gq1134},
  url = {https://pubs.usgs.gov/publication/gq1134},
  note = {Source identifier: gq1134}
}