@misc{indiciaee2c884905398,
  title = {Preliminary photointerpretation map of landslide and other surficial deposits of the Concord 15-minute quadrangle and the Oakland West, Richmond, and part of the San Quentin 7 1/2-minute quadrangles, Contra Costa and Alameda Counties, California},
  author = {T. H. Nilsen},
  year = {1973},
  doi = {10.3133/mf493},
  url = {https://pubs.usgs.gov/publication/mf493},
  note = {Source identifier: mf493}
}