@misc{indiciae4aaae306e657,
  title = {Metallic mineral resources map of the Gulkana quadrangle, Alaska},
  author = {Neal A. Matson},
  year = {1969},
  doi = {10.3133/ofr69163},
  url = {https://pubs.usgs.gov/publication/ofr69163},
  note = {Source identifier: ofr69163}
}