United States. Bureau of the Census. "Foreign Trade," in United States. Bureau of the Census. "March 1977," Business Conditions Digest (March 1977) : 51-51. https://fraser.stlouisfed.org/title/43/item/7367/toc/276404 , accessed on March 28, 2024.
United States. Bureau of the Census. "Foreign Trade," in United States. Bureau of the Census. "March 1977," Business Conditions Digest (March 1977) : 51-51. https://fraser.stlouisfed.org/title/43/item/7367/toc/276404 , accessed on March 28, 2024.