@misc{indiciae59cc78dd5847,
  title = {Stratigraphic framework of Cambrian and Ordovician rocks in the central Appalachian Basin from Campbell County Kentucky, to Tazwell County, Virginia},
  author = {Robert T. Ryder and John E. Repetski and Anita G. Harris and Erika E. Revised and digitized by Lentz},
  year = {2004},
  doi = {10.3133/i2530\_v2},
  url = {https://pubs.usgs.gov/publication/i2530\_v2},
  note = {Source identifier: i2530\_v2}
}