@misc{indiciae58e293781b46,
  title = {Stratigraphic framework of Cambrian and Ordovician rocks in the central Appalachian basin from Richland County, Ohio, to Rockingham County, Virginia},
  author = {Robert T. Ryder and Robert D. Crangle},
  year = {2014},
  doi = {10.3133/pp1708e.2.3},
  url = {https://pubs.usgs.gov/publication/pp1708E.2.3},
  note = {Source identifier: pp1708E.2.3}
}