@misc{indiciae6b097d3b1f5b,
  title = {Geologic maps on Alaska published by the U.S. Geological Survey, post-1930: scales 1:20,000 to 1:63,360 (through October 1982)},
  author = {B. A. Hopkins},
  year = {1983},
  doi = {10.3133/ofr83578},
  url = {https://pubs.usgs.gov/publication/ofr83578},
  note = {Source identifier: ofr83578}
}