@misc{indiciae346d492203bb,
  title = {Trace elements, carbon, and sulfur in Devonian black shale cores from Perry County, Kentucky; Jackson and Lincoln Counties, West Virginia; and Cattaraugus County, New York},
  author = {Joel S. Leventhal},
  year = {1978},
  doi = {10.3133/ofr78504},
  url = {https://pubs.usgs.gov/publication/ofr78504},
  note = {Source identifier: ofr78504}
}