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The Ivuna salt flats, south-east of Lake Rukwa have been exploited for salt since the early 13th century, or before, to the 15th century. Significant amounts of iron age pottery have been found here.
- "Population by Sex, Number of Households and Average Household Size". Government of Tanzania. Archived from the original on 2008-11-18. Retrieved 2008-08-18.
- Konczac, Zbigniew A. (1977). An Economic History of Tropical Africa: The pre-colonial period. Abingdon: Frank Cass. ISBN 0-7146-2919-7.
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