@misc{indiciae979dd3cd5bf1,
  title = {Preliminary geologic map of the Clear Lake SW Quadrangle, Skagit and Snohomish counties, Washington},
  author = {David P. Dethier and John T. Whetten},
  year = {1980},
  doi = {10.3133/ofr80825},
  url = {https://pubs.usgs.gov/publication/ofr80825},
  note = {Source identifier: ofr80825}
}