@misc{indiciae11e278ebdd2f,
  title = {The lower Ordovician gastropod Ceratopea},
  author = {E. L. Yochelson and Josiah Bridge},
  year = {1957},
  doi = {10.3133/pp294h},
  url = {https://pubs.usgs.gov/publication/pp294H},
  note = {Source identifier: pp294H}
}