@misc{indiciae06b380997703,
  title = {Preliminary geologic map of The Geysers steam field and vicinity, Sonoma County, California},
  author = {R. J. McLaughlin},
  year = {1974},
  doi = {10.3133/ofr74238},
  url = {https://pubs.usgs.gov/publication/ofr74238},
  note = {Source identifier: ofr74238}
}