@misc{indiciae28938605685c,
  title = {Elevation maps of the San Francisco Bay region, California, a digital database},
  author = {Scott E. Graham and Richard J. Pike},
  year = {1998},
  doi = {10.3133/ofr98625},
  url = {https://pubs.usgs.gov/publication/ofr98625},
  note = {Source identifier: ofr98625}
}