@misc{indiciaeddc0067724f6,
  title = {Preliminary geologic map of the Mt. Vernon quadrangle, Oregon},
  author = {T. P. Thayer},
  year = {1956},
  doi = {10.3133/mf50},
  url = {https://pubs.usgs.gov/publication/mf50},
  note = {Source identifier: mf50}
}