@misc{indiciae81746ead36c7,
  title = {Geology of the Spirit Mountain quadrangle, northwestern Oregon},
  author = {E.M. Baldwin and Albert Eugene Roberts},
  year = {1952},
  doi = {10.3133/om129},
  url = {https://pubs.usgs.gov/publication/om129},
  note = {Source identifier: om129}
}