1. The use of copper by the Delaware Indians;Abbott;The American Naturalist,1885
2. Trace-element variability of native copper within a large ore body: Kingston Mine, Michigan, USA;Allert;Geoarchaeology,1991
3. Nuggets;Anonymous;Maine Mining Journal,1880
4. Instrumental neutron activation analysis of copper and brass from the Auger Site (BdGw-3), Simcoe County, Ontario;Anselmi;Northeast Anthropology,1997
5. The copper deposits of Adams County, Pennsylvania;Bailey;The Engineering and Mining Journal,1883