What kinds of evidence do historians use to find out about trade and trade routes?

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QUESTION: What kind of evidence do historians use to find about trades and trades routes?

ANSWER: Nothern Black Polished Ware, the fine pottery were found from several archaeological sites throughout the sub continent and many Roman gold coins which were found in south India as traders carried many goods to home in Caravans from South Indian, several as the kind of evidences trade and trade routes.

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