@misc{indiciae5ecc16894185,
  title = {Photogeologic map of the Navajo Mountain-13 quadrangle, Kane and San Juan Counties, Utah, and Coconino County, Arizona},
  author = {R.J. Hackman},
  year = {1956},
  doi = {10.3133/i184},
  url = {https://pubs.usgs.gov/publication/i184},
  note = {Source identifier: i184}
}