@misc{indiciae1718962df43e,
  title = {Photogeologic map of the Elk Ridge 12 quadrangle, San Juan County, Utah},
  author = {Robert J. Hackman},
  year = {1952},
  doi = {10.3133/ofr5262},
  url = {https://pubs.usgs.gov/publication/ofr5262},
  note = {Source identifier: ofr5262}
}