@misc{indiciae355559284638,
  title = {Photogeologic map of the Clay Hills-1 quadrangle, San Juan County, Utah},
  author = {C. H. Marshall},
  year = {1955},
  doi = {10.3133/i51},
  url = {https://pubs.usgs.gov/publication/i51},
  note = {Source identifier: i51}
}