These three volumes, along with the forthcoming Volume 2D, the catalogue of metal and metal-related finds, present the results of a thorough, detailed study of the metals recovered during archaeological investigations in 1974 and 1975 at the village of Ban Chiang and three smaller sites in the northern part of northeast Thailand. At a time when little was known of Southeast Asian prehistory, the finding of very elaborately painted earthenware pottery vessels, probably prehistoric, at Ban Chiang stirred the interest not only of archaeologists, but also, unfortunately, from the standpoint of scientific investigation of the past, that of looters, dealers, and collectors of antiquarian art. In order to recover a sample of these vessels in their original depositional context, the Thailand Fine Arts Department and the University of Pennsylvania undertook one of the largest excavations of a prehistoric site carried out in Southeast Asia at the time. What subsequently caused added excitement in the media and the scientific community was the recovery of artefacts of iron that appeared to date to the second millennium BCE and of copper or bronze associated with dates in the fourth millennium BCE, perhaps as early as 3600 BCE, seeming to confirm similar early dates for bronze working from the nearby site of Non Nok Tha. Such early dates suggested the possibility of an independent development of metallurgy in Southeast Asia. Because of the importance of the excavation at Ban Chiang as a milestone in Thai and Southeast Asian archaeology, the site was later placed on the UNESCO World Heritage List.