@misc{indiciae4ce8f7f22566,
  title = {Geologic Map and Map Database of Eastern Sonoma and Western Napa Counties, California},
  author = {R. W. Graymer and E. E. Brabb and D. L. Jones and J. Barnes and R.S. Nicholson and R.E. Stamski},
  year = {2007},
  doi = {10.3133/sim2956},
  url = {https://pubs.usgs.gov/publication/sim2956},
  note = {Source identifier: sim2956}
}