United States. Bureau of the Census. "Foreign Trade," in United States. Bureau of the Census. "February 1990," Business Conditions Digest (February 1990) : 90-90. https://fraser.stlouisfed.org/title/43/item/7522/toc/291896 , accessed on May 4, 2024.
United States. Bureau of the Census. "Foreign Trade," in United States. Bureau of the Census. "February 1990," Business Conditions Digest (February 1990) : 90-90. https://fraser.stlouisfed.org/title/43/item/7522/toc/291896 , accessed on May 4, 2024.