United States. Bureau of the Census. "Foreign Trade," in United States. Bureau of the Census. "February 1973," Business Conditions Digest (February 1973) : 19-19. https://fraser.stlouisfed.org/title/43/item/7318/toc/394651 , accessed on May 7, 2024.
United States. Bureau of the Census. "Foreign Trade," in United States. Bureau of the Census. "February 1973," Business Conditions Digest (February 1973) : 19-19. https://fraser.stlouisfed.org/title/43/item/7318/toc/394651 , accessed on May 7, 2024.