@misc{indiciae0a4353311a20,
  title = {Germanium and uranium in coalified wood from upper Devonian black shale},
  author = {Irving A. Breger and J. M. Schopf},
  year = {1955},
  doi = {10.1016/0016-7037(55)90038-7},
  url = {https://pubs.usgs.gov/publication/70010747},
  note = {Source identifier: 70010747}
}