@misc{indiciae0174eeab6a4a,
  title = {Geochemistry of trace elements and uranium in Devonian shales of the Appalachian Basin},
  author = {Joel S. Leventhal and J.G. Crock and M.J. Malcolm},
  year = {1981},
  doi = {10.3133/ofr81778},
  url = {https://pubs.usgs.gov/publication/ofr81778},
  note = {Source identifier: ofr81778}
}