@misc{indiciaef9df4708a9ad,
  title = {Photogeologic map of the Virgin SW quadrangle, Washington County, Utah},
  author = {C. H. Marshall},
  year = {1956},
  doi = {10.3133/i147},
  url = {https://pubs.usgs.gov/publication/i147},
  note = {Source identifier: i147}
}