@misc{indiciaec5e610476ba7,
  title = {Preliminary geologic map of the Val Verde 7.5' quadrangle, southern California: A digital database},
  author = {R. F. Yerkes and Russell H. Campbell},
  year = {1995},
  doi = {10.3133/ofr95699},
  url = {https://pubs.usgs.gov/publication/ofr95699},
  note = {Source identifier: ofr95699}
}