United States. Bureau of the Census. "Foreign Trade," in United States. Bureau of the Census. "July 1975," Business Conditions Digest (July 1975) : 58-58. https://fraser.stlouisfed.org/title/43/item/7347/toc/239365 , accessed on May 9, 2024.
United States. Bureau of the Census. "Foreign Trade," in United States. Bureau of the Census. "July 1975," Business Conditions Digest (July 1975) : 58-58. https://fraser.stlouisfed.org/title/43/item/7347/toc/239365 , accessed on May 9, 2024.