@misc{indiciae81710128c8e3,
  title = {Preliminary geologic map of the unincorporated part of the Topanga Quadrangle, Los Angeles County, California},
  author = {R. F. Yerkes and R. H. Campbell and J. E. Schoellhamer and P. W. Birkeland},
  year = {1973},
  doi = {10.3133/ofr73367},
  url = {https://pubs.usgs.gov/publication/ofr73367},
  note = {Source identifier: ofr73367}
}