@misc{indiciae0ed6b6243927,
  title = {Photogeologic map of the Elk Ridge-2 quadrangle, San Juan County, Utah},
  author = {R.J. Hackman},
  year = {1955},
  doi = {10.3133/i7},
  url = {https://pubs.usgs.gov/publication/i7},
  note = {Source identifier: i7}
}