@misc{indiciae860321bd0901,
  title = {The brachiopod genera Hebertella, Dalmanella, and Heterorthina from the Ordovician of Kentucky},
  author = {L.G. Walker},
  year = {1982},
  doi = {10.3133/pp1066m},
  url = {https://pubs.usgs.gov/publication/pp1066M},
  note = {Source identifier: pp1066M}
}