@misc{indiciaec7d9c104e3cf,
  title = {Photogeologic map of the Mt. Pennell-14 quadrangle, Garfield and Kane Counties, Utah},
  author = {R.J. Hackman},
  year = {1955},
  doi = {10.3133/i50},
  url = {https://pubs.usgs.gov/publication/i50},
  note = {Source identifier: i50}
}