@misc{indiciae0599e5a0c5b6,
  title = {Ash-flow tuffs: Their origin, geologic relations, and identification},
  author = {Clarence S. Ross and Robert L. Smith},
  year = {1961},
  doi = {10.3133/pp366},
  url = {https://pubs.usgs.gov/publication/pp366},
  note = {Source identifier: pp366}
}