@misc{indiciae5b1969c26bfa,
  title = {Historical files from Federal government mineral exploration-assistance programs, 1950 to 1974},
  author = {David G. Frank},
  year = {2010},
  doi = {10.3133/fs20103109},
  url = {https://pubs.usgs.gov/publication/fs20103109},
  note = {Source identifier: fs20103109}
}