United States. Bureau of the Census. "Foreign Trade," in United States. Bureau of the Census. "October 1969," Business Conditions Digest (October 1969) : 73-73. https://fraser.stlouisfed.org/title/43/item/7535/toc/394770 , accessed on May 11, 2024.
United States. Bureau of the Census. "Foreign Trade," in United States. Bureau of the Census. "October 1969," Business Conditions Digest (October 1969) : 73-73. https://fraser.stlouisfed.org/title/43/item/7535/toc/394770 , accessed on May 11, 2024.