@misc{indiciaef9558bfbdb4d,
  title = {On the Cambrian faunas of North America (preliminary studies)},
  author = {Charles D. Walcott},
  year = {1884},
  doi = {10.3133/b10},
  url = {https://pubs.usgs.gov/publication/b10},
  note = {Source identifier: b10}
}