@misc{indiciaefd6c6de50371,
  title = {Geochemistry of uranium in phosphorites and black shales of the Phosphoria formation},
  author = {Richard Porter Sheldon},
  year = {1959},
  doi = {10.3133/b1084d},
  url = {https://pubs.usgs.gov/publication/b1084D},
  note = {Source identifier: b1084D}
}