@misc{indiciae0c84d472a71e,
  title = {Geologic map of the East of Grotto Hills quadrangle, California: A digital database},
  author = {Jane E. Nielson and David R. Bedford},
  year = {1999},
  doi = {10.3133/ofr9935},
  url = {https://pubs.usgs.gov/publication/ofr9935},
  note = {Source identifier: ofr9935}
}