How did Sumerian civilizations obtain resources that were not available in the Fertile Crescent?

The Sumerian were able to source for unavailable resources through revenue made from traded agricultural product
The Sumerian was an ancient civilization which occupied the "Mesopotamia region" in Fertile Crescent.
In conclusion, because of lack of resources (such as wood, stone, metal) on their land, they traded agricultural product (such as grain) to get what was not available in the Fertile Crescent.
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