@misc{indiciae564280eca853,
  title = {Reconnaissance geologic map of the Petersburg B-4 quadrangle, southeastern Alaska},
  author = {David A. Brew},
  year = {1997},
  doi = {10.3133/ofr97156f},
  url = {https://pubs.usgs.gov/publication/ofr97156F},
  note = {Source identifier: ofr97156F}
}