@misc{indiciaecab4d48712c4,
  title = {Reconnaissance geologic map of the Petersburg C-4 quadrangle, southeastern Alaska},
  author = {David A. Brew},
  year = {1997},
  doi = {10.3133/ofr97156j},
  url = {https://pubs.usgs.gov/publication/ofr97156J},
  note = {Source identifier: ofr97156J}
}