@misc{indiciaef02492c4daa2,
  title = {Stratigraphic framework of cambrian and ordovician rocks in the central Appalachian basin from Lake County, Ohio, to Juniata County, Pennsylvania},
  author = {Robert T. Ryder and Robert D. Crangle},
  year = {2014},
  doi = {10.3133/pp1708e.2.1},
  url = {https://pubs.usgs.gov/publication/pp1708E.2.1},
  note = {Source identifier: pp1708E.2.1}
}