@misc{indiciaeb54858eec34e,
  title = {The Mesozoic Echinodermata of the United States},
  author = {William Bullock Clark},
  year = {1893},
  doi = {10.3133/b97},
  url = {https://pubs.usgs.gov/publication/b97},
  note = {Source identifier: b97}
}