@misc{indiciae20d39086095d,
  title = {Petroleum source rock potential of the Upper Ordovician black shale sequence, northern Appalachian basin},
  author = {L.G. Wallace and J.B. Roen},
  year = {1989},
  doi = {10.3133/ofr89488},
  url = {https://pubs.usgs.gov/publication/ofr89488},
  note = {Source identifier: ofr89488}
}