United States. Bureau of the Census. "Foreign Trade," in United States. Bureau of the Census. "August 1987," Business Conditions Digest (August 1987) : 88-88. https://fraser.stlouisfed.org/title/43/item/7492/toc/113579 , accessed on April 26, 2024.
United States. Bureau of the Census. "Foreign Trade," in United States. Bureau of the Census. "August 1987," Business Conditions Digest (August 1987) : 88-88. https://fraser.stlouisfed.org/title/43/item/7492/toc/113579 , accessed on April 26, 2024.