@misc{indiciae0304382320e4,
  title = {Geologic mapping in Alaska: U.S. Geological Survey, post-1930, scales 1:20,000 to 1:63,360},
  author = {Susan B. Bartsch-Winkler},
  year = {1977},
  doi = {10.3133/ofr77682},
  url = {https://pubs.usgs.gov/publication/ofr77682},
  note = {Source identifier: ofr77682}
}