@misc{indiciae5871186b6973,
  title = {Photogeologic map of the Shinarump NW quadrangle, Coconino County, Arizona},
  author = {R. H. Morris},
  year = {1956},
  doi = {10.3133/i139},
  url = {https://pubs.usgs.gov/publication/i139},
  note = {Source identifier: i139}
}