@misc{indiciae041568fe6572,
  title = {Calymenid and other Ordovician trilobites from Kentucky and Ohio},
  author = {Reuben James Ross},
  year = {1967},
  doi = {10.3133/pp583b},
  url = {https://pubs.usgs.gov/publication/pp583B},
  note = {Source identifier: pp583B}
}