United States. Bureau of the Census. "Foreign Trade," in United States. Bureau of the Census. "January 1990," Business Conditions Digest (January 1990) : 90-90. https://fraser.stlouisfed.org/title/43/item/7521/toc/71057 , accessed on April 23, 2024.
United States. Bureau of the Census. "Foreign Trade," in United States. Bureau of the Census. "January 1990," Business Conditions Digest (January 1990) : 90-90. https://fraser.stlouisfed.org/title/43/item/7521/toc/71057 , accessed on April 23, 2024.