@misc{indiciaef0c581c0977d,
  title = {Map showing surficial geology of parts of the lower Skagit and Baker valleys, North Cascades, Washington},
  author = {Paul L. Heller},
  year = {1979},
  doi = {10.3133/ofr79964},
  url = {https://pubs.usgs.gov/publication/ofr79964},
  note = {Source identifier: ofr79964}
}