@misc{indiciae6021af75f9d1,
  title = {Geologic map of the Wilbur Springs Quadrangle, Colusa and Lake counties, California},
  author = {E.I. Rich},
  year = {1971},
  doi = {10.3133/i538},
  url = {https://pubs.usgs.gov/publication/i538},
  note = {Source identifier: i538}
}