@misc{indiciae908795cbd8e9,
  title = {The Pierre Shale, northern Great Plains; a potential isolation medium for radioactive waste},
  author = {George W. Shurr},
  year = {1977},
  doi = {10.3133/ofr77776},
  url = {https://pubs.usgs.gov/publication/ofr77776},
  note = {Source identifier: ofr77776}
}