U.S. exports: Country by commodity groupings. U.S. Government Printing Office.
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Citação norma Chicago
U.S. Exports: Country by Commodity Groupings. Washington: U.S. Government Printing Office.
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Citação norma MLA
U.S. Exports: Country by Commodity Groupings. U.S. Government Printing Office.
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Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.