@misc{indiciae27ee9a446325,
  title = {Supergene alteration of uranium-bearing veins in the United States},
  author = {George Walton Walker},
  year = {1957},
  doi = {10.3133/tei693},
  url = {https://pubs.usgs.gov/publication/tei693},
  note = {Source identifier: tei693}
}