@misc{indiciae229738174d34,
  title = {Vegetation of northwestern North America, as an aid in interpretation of geologic data},
  author = {Robert S. Sigafoos},
  year = {1958},
  doi = {10.3133/b1061e},
  url = {https://pubs.usgs.gov/publication/b1061E},
  note = {Source identifier: b1061E}
}