@misc{indiciae3d12ed922ec4,
  title = {Uranium in black shale deposits, northern Rocky Mountains and Great Plains},
  author = {W. J. Mapel},
  year = {1956},
  doi = {10.3133/b1030h},
  url = {https://pubs.usgs.gov/publication/b1030H},
  note = {Source identifier: b1030H}
}