@misc{indiciae131c2846c7d3,
  title = {Copper artifacts from prehistoric archeological sites in the Dakotas},
  author = {W.E. Hill and R.W. Neuman},
  year = {1966},
  doi = {10.1126/science.154.3753.1171},
  url = {https://pubs.usgs.gov/publication/70010756},
  note = {Source identifier: 70010756}
}