@misc{indiciaeff7404034cfb,
  title = {Preliminary geologic map of the Courtrock quadrangle, Grant County, Oregon},
  author = {T. P. Thayer and C. Ervin Brown},
  year = {1967},
  doi = {10.3133/ofr67212},
  url = {https://pubs.usgs.gov/publication/ofr67212},
  note = {Source identifier: ofr67212}
}