@misc{indiciae4b570c621a49,
  title = {Photogeologic map, Elk Ridge-7 quadrangle, San Juan County, Utah},
  author = {Robert J. Hackman},
  year = {1955},
  doi = {10.3133/ofr5555},
  url = {https://pubs.usgs.gov/publication/ofr5555},
  note = {Source identifier: ofr5555}
}