@misc{indiciae1b0ff4b44efa,
  title = {Stratigraphic framework of Cambrian and Ordovician rocks in the central Appalachian Basin from Lake County, Ohio, to Juniata County, Pennsylvania},
  author = {R. T. Ryder},
  year = {1992},
  doi = {10.3133/i2200},
  url = {https://pubs.usgs.gov/publication/i2200},
  note = {Source identifier: i2200}
}