@misc{indiciae772f6d9b369e,
  title = {Maps showing geology, oil and gas fields and geologic provinces of the South America region},
  author = {Christopher J. Schenk and Roland J. Viger and Christopher P. Anderson},
  year = {2000},
  doi = {10.3133/ofr97470d},
  url = {https://pubs.usgs.gov/publication/ofr97470D},
  note = {Source identifier: ofr97470D}
}