United States. President and Council of Economic Advisers (U.S.). "U.S. International Trade in Goods, by Principal End-Use Category," in United States. President and Council of Economic Advisers (U.S.). "2007," Economic Report of the President (2007) : 343-343. https://fraser.stlouisfed.org/title/45/item/8106/toc/188828 , accessed on March 29, 2024.