United States. Bureau of the Census. "Foreign Trade," in United States. Bureau of the Census. "August 1980," Business Conditions Digest (August 1980) : 88-88. https://fraser.stlouisfed.org/title/43/item/7408/toc/157215 , accessed on March 28, 2024.
United States. Bureau of the Census. "Foreign Trade," in United States. Bureau of the Census. "August 1980," Business Conditions Digest (August 1980) : 88-88. https://fraser.stlouisfed.org/title/43/item/7408/toc/157215 , accessed on March 28, 2024.