@misc{indiciaeda0e7464f9dc,
  title = {Second contribution to the studies on the Cambrian faunas of North America},
  author = {Charles D. Walcott},
  year = {1886},
  doi = {10.3133/b30},
  url = {https://pubs.usgs.gov/publication/b30},
  note = {Source identifier: b30}
}