United States. Bureau of the Census. "Foreign Trade," in United States. Bureau of the Census. "August 1970," Business Conditions Digest (August 1970) : 88-88. https://fraser.stlouisfed.org/title/43/item/7545/toc/352960 , accessed on May 1, 2024.
United States. Bureau of the Census. "Foreign Trade," in United States. Bureau of the Census. "August 1970," Business Conditions Digest (August 1970) : 88-88. https://fraser.stlouisfed.org/title/43/item/7545/toc/352960 , accessed on May 1, 2024.