@misc{indiciaef9757d3da069,
  title = {Geologic map of Oregon},
  author = {George W. Walker and Norman S. MacLeod},
  year = {1991},
  doi = {10.3133/70210877},
  url = {https://pubs.usgs.gov/publication/70210877},
  note = {Source identifier: 70210877}
}