@misc{indiciae0722fbfadb73,
  title = {Photogeologic procedures in geologic interpretation and mapping},
  author = {Richard G. Ray},
  year = {1955},
  doi = {10.3133/ofr55144},
  url = {https://pubs.usgs.gov/publication/ofr55144},
  note = {Source identifier: ofr55144}
}