@misc{indiciaed08f74134397,
  title = {Preliminary geologic map of the Black River quadrangle, east-central Alaska},
  author = {Earl E. Brabb and Michael Churkin},
  year = {1969},
  doi = {10.3133/ofr6922},
  url = {https://pubs.usgs.gov/publication/ofr6922},
  note = {Source identifier: ofr6922}
}