@misc{indiciaee4234884cebd,
  title = {Preliminary photointerpretation maps of landslide and other surficial deposits of 56 7 1/2-minute quadrangles in the southeastern San Francisco Bay region, Alameda, Contra Costa, and Santa Clara counties, California},
  author = {Tor Helge Nilsen and J. A. Bartow and V. A. Frizzell and J.D. Sims},
  year = {1975},
  doi = {10.3133/ofr75277},
  url = {https://pubs.usgs.gov/publication/ofr75277},
  note = {Source identifier: ofr75277}
}