@misc{indiciae8eeac09fc627,
  title = {Geologic map of the Clark Lake Quadrangle, San Diego County, California},
  author = {T. G. Theodore and R. V. Sharp},
  year = {1975},
  doi = {10.3133/mf644},
  url = {https://pubs.usgs.gov/publication/mf644},
  note = {Source identifier: mf644}
}