@misc{indiciae6aff176cd412,
  title = {Echinoderms from Middle and Upper Ordovician rocks of Kentucky},
  author = {R.L. Parsley},
  year = {1981},
  doi = {10.3133/pp1066k},
  url = {https://pubs.usgs.gov/publication/pp1066K},
  note = {Source identifier: pp1066K}
}