United States. Bureau of the Census. "Foreign Trade," in United States. Bureau of the Census. "May 1973," Business Conditions Digest (May 1973) : 77-77. https://fraser.stlouisfed.org/title/43/item/7321/toc/34363 , accessed on April 25, 2024.
United States. Bureau of the Census. "Foreign Trade," in United States. Bureau of the Census. "May 1973," Business Conditions Digest (May 1973) : 77-77. https://fraser.stlouisfed.org/title/43/item/7321/toc/34363 , accessed on April 25, 2024.