United States. Bureau of the Census. "Foreign Trade," in United States. Bureau of the Census. "June 1973," Business Conditions Digest (June 1973) : 19-19. https://fraser.stlouisfed.org/title/43/item/7322/toc/166864 , accessed on April 19, 2024.
United States. Bureau of the Census. "Foreign Trade," in United States. Bureau of the Census. "June 1973," Business Conditions Digest (June 1973) : 19-19. https://fraser.stlouisfed.org/title/43/item/7322/toc/166864 , accessed on April 19, 2024.