@misc{indiciaeccdd19402d8a,
  title = {An engineering rock classification to evaluate seismic rock-fall susceptibility and its application to the Wasatch Front},
  author = {E. L. Harp and M.A. Noble},
  year = {1993},
  doi = {10.2113/gseegeosci.xxx.3.293},
  url = {https://pubs.usgs.gov/publication/70017865},
  note = {Source identifier: 70017865}
}