@misc{indiciae6f046a901355,
  title = {Photogeologic map of the Navajo Mountain-14 quadrangle, San Juan County, Utah, and Coconino County, Arizona},
  author = {R.J. Hackman},
  year = {1957},
  doi = {10.3133/i238},
  url = {https://pubs.usgs.gov/publication/i238},
  note = {Source identifier: i238}
}