@misc{indiciaed7be8014c1f3,
  title = {Map showing areas of estimated relative amounts of landslides in California},
  author = {D. H. Radbruch-Hall and K. C. Crowther},
  year = {1973},
  doi = {10.3133/i747},
  url = {https://pubs.usgs.gov/publication/i747},
  note = {Source identifier: i747}
}