@misc{indiciae0dc2a01f063d,
  title = {Black shale investigations, Block 3, Tennessee},
  author = {R.C. Robeck and Andrew Brown},
  year = {1950},
  doi = {10.3133/tei63},
  url = {https://pubs.usgs.gov/publication/tei63},
  note = {Source identifier: tei63}
}