@misc{indiciaebb33cd413969,
  title = {Geologic map of the Lopez Mountain quadrangle, San Luis Obispo County, California},
  author = {Hugh McLean},
  year = {1990},
  doi = {10.3133/ofr90650},
  url = {https://pubs.usgs.gov/publication/ofr90650},
  note = {Source identifier: ofr90650}
}