United States. Bureau of the Census. "Foreign Trade (chart)," in United States. Bureau of the Census. "May 1976," Business Conditions Digest (May 1976) : 54-54. https://fraser.stlouisfed.org/title/43/item/7357/toc/116557 , accessed on May 4, 2024.
United States. Bureau of the Census. "Foreign Trade (chart)," in United States. Bureau of the Census. "May 1976," Business Conditions Digest (May 1976) : 54-54. https://fraser.stlouisfed.org/title/43/item/7357/toc/116557 , accessed on May 4, 2024.