@misc{indiciaea51069d147c3,
  title = {Geologic map of the Bald Rock and Middle Fork Feather River Roadless Areas, Butte and Plumas counties, California},
  author = {M. L. Sorensen and Henry Pietropaoli},
  year = {1982},
  doi = {10.3133/mf1427a},
  url = {https://pubs.usgs.gov/publication/mf1427A},
  note = {Source identifier: mf1427A}
}