@misc{indiciae4c58af00d625,
  title = {Historical files from Federal Government mineral exploration-assistance programs, 1950 to 1974},
  author = {David G. Frank},
  year = {2016},
  doi = {10.3133/ds1004},
  url = {https://pubs.usgs.gov/publication/ds1004},
  note = {Source identifier: ds1004}
}