@misc{indiciae25fafff40c67,
  title = {Geochemistry of selected oil and source rock samples from Cambrian and Ordovician strata, Ohio-West Virginia-Tennessee part of the Appalachian Basin},
  author = {Robert T. Ryder and Robert Carlton Burruss and Joseph R. Hatch},
  year = {1991},
  doi = {10.3133/ofr91434},
  url = {https://pubs.usgs.gov/publication/ofr91434},
  note = {Source identifier: ofr91434}
}