United States. Bureau of the Census. "Foreign Trade," in United States. Bureau of the Census. "July 1972," Business Conditions Digest (July 1972) : 77-77. https://fraser.stlouisfed.org/title/43/item/7568/toc/328480 , accessed on March 29, 2024.
United States. Bureau of the Census. "Foreign Trade," in United States. Bureau of the Census. "July 1972," Business Conditions Digest (July 1972) : 77-77. https://fraser.stlouisfed.org/title/43/item/7568/toc/328480 , accessed on March 29, 2024.