United States. Bureau of the Census. "Foreign Trade," in United States. Bureau of the Census. "June 1975," Business Conditions Digest (June 1975) : 81-81. https://fraser.stlouisfed.org/title/43/item/7346/toc/263759 , accessed on April 23, 2024.
United States. Bureau of the Census. "Foreign Trade," in United States. Bureau of the Census. "June 1975," Business Conditions Digest (June 1975) : 81-81. https://fraser.stlouisfed.org/title/43/item/7346/toc/263759 , accessed on April 23, 2024.