@misc{indiciaef7955e6e56d6,
  title = {1:100,000-scale topographic contours derived from digital elevation models, San Francisco Bay region, California: a digital database},
  author = {Heather M. Wright and Carl M. Wentworth},
  year = {2001},
  doi = {10.3133/ofr01101},
  url = {https://pubs.usgs.gov/publication/ofr01101},
  note = {Source identifier: ofr01101}
}