United States. Bureau of the Census. "Foreign Trade," in United States. Bureau of the Census. "August 1969," Business Conditions Digest (August 1969) : 72-72. https://fraser.stlouisfed.org/title/43/item/7533/toc/216382 , accessed on April 25, 2024.
United States. Bureau of the Census. "Foreign Trade," in United States. Bureau of the Census. "August 1969," Business Conditions Digest (August 1969) : 72-72. https://fraser.stlouisfed.org/title/43/item/7533/toc/216382 , accessed on April 25, 2024.