Why rubber is not important commercial product of amazon bassin?

or:Why rubber is not important commercial product of amazon bassin?or:Rubber is still an important commercial product of the amazonian basin, but the

or:Why rubber is not important commercial product of amazon bassin?

or:Rubber is still an important commercial product of the amazonian basin, but the great rubber boom of the industrial revolution ended with the invention of petroleum products. Rubber was still very important during WWI and WWII.

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