@misc{indiciaeb88fd1ff92db,
  title = {Geologic map of the eastern Willapa Hills, Cowlitz, Lewis, Pacific, and Wahkiakum counties, Washington},
  author = {Ray E. Wells},
  year = {1981},
  doi = {10.3133/ofr81674},
  url = {https://pubs.usgs.gov/publication/ofr81674},
  note = {Source identifier: ofr81674}
}