@misc{indiciae88f5944c9f17,
  title = {Volume of organic-rich Devonian shale in the Appalachian Basin: relating "black" to organic-matter content: Geologic notes},
  author = {Ronald R. Charpentier and James W. Schmoker},
  year = {1982},
  doi = {10.1306/03b59b1b-16d1-11d7-8645000102c1865d},
  url = {https://pubs.usgs.gov/publication/70188943},
  note = {Source identifier: 70188943}
}