United States. Bureau of the Census. "Foreign Trade," in United States. Bureau of the Census. "May 1989," Business Conditions Digest (May 1989) : 90-90. https://fraser.stlouisfed.org/title/43/item/7513/toc/331727 , accessed on March 29, 2024.
United States. Bureau of the Census. "Foreign Trade," in United States. Bureau of the Census. "May 1989," Business Conditions Digest (May 1989) : 90-90. https://fraser.stlouisfed.org/title/43/item/7513/toc/331727 , accessed on March 29, 2024.