@misc{indiciae30e8a382082b,
  title = {Preliminary map of upper Eocene to Holocene volcanic and related rocks of the Cascade Range, Oregon},
  author = {David R. Sherrod and James G. Smith},
  year = {1989},
  doi = {10.3133/ofr8914},
  url = {https://pubs.usgs.gov/publication/ofr8914},
  note = {Source identifier: ofr8914}
}