@misc{indiciaecb018fa7d877,
  title = {Photo-image map of parts of Peru, Bolivia, and Chile},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1967},
  doi = {10.3133/ofr67259},
  url = {https://pubs.usgs.gov/publication/ofr67259},
  note = {Source identifier: ofr67259}
}