@misc{indiciaebb429d9c8a32,
  title = {Bishop ash: A widespread volcanic ash extended to southern California},
  author = {Richard Merriam and James L. Bischoff},
  year = {1975},
  doi = {10.1306/212f6d07-2b24-11d7-8648000102c1865d},
  url = {https://pubs.usgs.gov/publication/70231540},
  note = {Source identifier: 70231540}
}