United States. President and Council of Economic Advisers (U.S.). "U.S. Merchandise Exports and Imports by Principle End-Use Categories," in United States. President and Council of Economic Advisers (U.S.). "1993," Economic Report of the President (1993) : 465-465. https://fraser.stlouisfed.org/title/45/item/8092/toc/317944 , accessed on April 23, 2024.