@misc{indiciae3c7a1faf8254,
  title = {Chemical and mineralogical analysis of devonian black-shale samples from Martin County, Kentucky; Carroll and Washington counties, Ohio; Wise County, Virginia; and Overton County, Tennessee, U.S.A.},
  author = {J.S. Leventhal and J. W. Hosterman},
  year = {1982},
  doi = {10.1016/0009-2541(82)90081-x},
  url = {https://pubs.usgs.gov/publication/70011550},
  note = {Source identifier: 70011550}
}