United States. Bureau of the Census. "Foreign Trade," in United States. Bureau of the Census. "March 1975," Business Conditions Digest (March 1975) : 77-77. https://fraser.stlouisfed.org/title/43/item/7343/toc/63842 , accessed on April 23, 2024.
United States. Bureau of the Census. "Foreign Trade," in United States. Bureau of the Census. "March 1975," Business Conditions Digest (March 1975) : 77-77. https://fraser.stlouisfed.org/title/43/item/7343/toc/63842 , accessed on April 23, 2024.