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.). "1979," Economic Report of the President (1979) : 302-302. https://fraser.stlouisfed.org/title/45/item/8150/toc/131818 , accessed on March 19, 2024.