@misc{indiciae1398580fbfef,
  title = {Geologic map of the Ketchikan and Prince Rupert quadrangles, southeastern Alaska},
  author = {H. C. Berg and Raymond L. Elliott and R. D. Koch},
  year = {1988},
  doi = {10.3133/i1807},
  url = {https://pubs.usgs.gov/publication/i1807},
  note = {Source identifier: i1807}
}