@misc{indiciaea94f0ded0c8e,
  title = {Contributions to North American Ethnology, Volume V, Part I: Observations on cup-shaped and other lapidarian sculptures in the Old World and in America},
  author = {Charles Rau and John Wesley Powell},
  year = {1881},
  doi = {10.3133/70039926},
  url = {https://pubs.usgs.gov/publication/70039926},
  note = {Source identifier: 70039926}
}