@misc{indiciae1581b2307584,
  title = {Eastern and central Montana as a possible source area of uranium},
  author = {Frank Clarkson Armstrong},
  year = {1957},
  doi = {10.2113/gsecongeo.52.3.211},
  url = {https://pubs.usgs.gov/publication/70216354},
  note = {Source identifier: 70216354}
}