@misc{indiciae5e3692b579e8,
  title = {Geologic map of the lower Umpqua River area, Oregon},
  author = {E.M. Baldwin},
  year = {1961},
  doi = {10.3133/om204},
  url = {https://pubs.usgs.gov/publication/om204},
  note = {Source identifier: om204}
}