@misc{indiciaea21aac99e781,
  title = {Reconnaissance geologic map of the Petersburg A-2 quadrangle, southeastern Alaska},
  author = {David A. Brew},
  year = {1997},
  doi = {10.3133/ofr97156a},
  url = {https://pubs.usgs.gov/publication/ofr97156A},
  note = {Source identifier: ofr97156A}
}