@misc{indiciaec63906de289f,
  title = {Stratigraphic framework of Cambrian and Ordovician rocks in the central Appalachian basin from Morrow County, Ohio, to Pendleton County, West Virginia},
  author = {Robert T. Ryder},
  year = {1992},
  doi = {10.3133/b1839g},
  url = {https://pubs.usgs.gov/publication/b1839G},
  note = {Source identifier: b1839G}
}