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(A) Late Chalcolithic (1400–900 BC), Iron Age (900–200 BC) and Early Historic (200 BC – 400 AD) Vigna finds from South India, indicating size increase. (B) Archaeological Vigna measurements from northern India, including Ganges valley Neolithic, Iron Age and Harappan Bronze Age civilization finds, suggesting a correlation between larger size and plough agriculture (data from Fuller and Harvey, 2006).
