United States. Bureau of the Census. "Gross National Product," in United States. Bureau of the Census. "May 1976," Business Conditions Digest (May 1976) : 15-15. https://fraser.stlouisfed.org/title/43/item/7357/toc/116536 , accessed on May 9, 2024.
United States. Bureau of the Census. "Gross National Product," in United States. Bureau of the Census. "May 1976," Business Conditions Digest (May 1976) : 15-15. https://fraser.stlouisfed.org/title/43/item/7357/toc/116536 , accessed on May 9, 2024.