@misc{indiciae16815cd5bead,
  title = {Uranium in carbonaceous rocks in the Townsend and Helena Valleys, Montana},
  author = {George Earle Becraft},
  year = {1958},
  doi = {10.3133/b1046g},
  url = {https://pubs.usgs.gov/publication/b1046G},
  note = {Source identifier: b1046G}
}