@misc{indiciae6d99abf2024a,
  title = {Preliminary contour map showing elevation of surface of Pleistocene alluvium under Santa Clara Valley, California},
  author = {Edward J. Helley},
  year = {1991},
  doi = {10.3133/ofr90633},
  url = {https://pubs.usgs.gov/publication/ofr90633},
  note = {Source identifier: ofr90633}
}