United States. Bureau of the Census. "Foreign Trade," in United States. Bureau of the Census. "April 1989," Business Conditions Digest (April 1989) : 52-52. https://fraser.stlouisfed.org/title/43/item/7512/toc/317192 , accessed on April 26, 2024.
United States. Bureau of the Census. "Foreign Trade," in United States. Bureau of the Census. "April 1989," Business Conditions Digest (April 1989) : 52-52. https://fraser.stlouisfed.org/title/43/item/7512/toc/317192 , accessed on April 26, 2024.