@misc{indiciae9c91b153b946,
  title = {Shaded-relief topographic map of San Mateo County, California},
  author = {R. K. Mark and D. S. Aitken},
  year = {1990},
  doi = {10.3133/i1257k},
  url = {https://pubs.usgs.gov/publication/i1257K},
  note = {Source identifier: i1257K}
}