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.). "1987," Economic Report of the President (1987) : 366-366. https://fraser.stlouisfed.org/title/45/item/8158/toc/290411 , accessed on April 18, 2024.