@misc{indiciae5b3a47c09468,
  title = {Preliminary geologic map of Seattle and vicinity, Washington},
  author = {Howard Hamilton Waldron},
  year = {1961},
  doi = {10.3133/ofr61168},
  url = {https://pubs.usgs.gov/publication/ofr61168},
  note = {Source identifier: ofr61168}
}