@misc{indiciae1475f8a8edfb,
  title = {Geologic map of a part of the Cascade Range between latitudes 43°–44°, central Oregon},
  author = {D. R. Sherrod},
  year = {1991},
  doi = {10.3133/i1891},
  url = {https://pubs.usgs.gov/publication/i1891},
  note = {Source identifier: i1891}
}