@misc{indiciae8440dcf11985,
  title = {Preliminary landslide map of the Yucaipa 7.5' quadrangle, California},
  author = {Jonathan C. Matti},
  year = {1984},
  doi = {10.3133/ofr84520},
  url = {https://pubs.usgs.gov/publication/ofr84520},
  note = {Source identifier: ofr84520}
}