The 1912 Yale Peruvian Scientific Expedition Collections from Machu Picchu : Metal Artifacts

"This synthesis of the archaeological evidence of metallurgy at Machu Picchu interprets new data on Inca metal artifacts that represent the final stage of pre-Columbian metallurgical technology in the central Andes of South America. These artifacts were recovered early in the 20th century by the Yale Univeristy Peruvian Scientific Expeditions"--Pro