TY  - RPRT
TI  - Copper artifacts from prehistoric archeological sites in the Dakotas
AU  - W.E. Hill
AU  - R.W. Neuman
PY  - 1966
DO  - 10.1126/science.154.3753.1171
UR  - https://pubs.usgs.gov/publication/70010756
ID  - 70010756
ER  -