United States. Bureau of the Census. "Foreign Trade," in United States. Bureau of the Census. "June 1978," Business Conditions Digest (June 1978) : 51-51. https://fraser.stlouisfed.org/title/43/item/7382/toc/110226 , accessed on March 28, 2024.
United States. Bureau of the Census. "Foreign Trade," in United States. Bureau of the Census. "June 1978," Business Conditions Digest (June 1978) : 51-51. https://fraser.stlouisfed.org/title/43/item/7382/toc/110226 , accessed on March 28, 2024.