@misc{indiciae576e4f2f3c44,
  title = {II.-Note on Some Appendages of the Trilobites},
  author = {Charles D. Walcott},
  year = {2009},
  doi = {10.1017/s0016756800141135},
  url = {https://pubs.usgs.gov/publication/70208045},
  note = {Source identifier: 70208045}
}