@misc{indiciae478d3b9d8994,
  title = {Some Cretaceous echinoids from the Americas},
  author = {C.W. Cooke},
  year = {1955},
  doi = {10.3133/pp264e},
  url = {https://pubs.usgs.gov/publication/pp264E},
  note = {Source identifier: pp264E}
}