@misc{indiciae674cf2d387b6,
  title = {Photogeologic map of the Mount Peale-9 quadrangle, San Juan County, Utah, and Montrose and San Miguel Counties, Colorado},
  author = {R.J. Hackman},
  year = {1956},
  doi = {10.3133/i157},
  url = {https://pubs.usgs.gov/publication/i157},
  note = {Source identifier: i157}
}