Salt: A World History
The only rock we eat, salt has shaped civilization from the very beginning, and its story is a glittering, often surprising part of the history of humankind. A substance so valuable it served as currency, salt has influenced the establishment of trade routes and cities, provoked and financed wars, secured empires, and inspired revolutions.
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Kurlansky , M. (2002). Salt: A World History. New York, NY: Walker and Co..