United States. Bureau of the Census. "NBER Short List," in United States. Bureau of the Census. "July 1970," Business Conditions Digest (July 1970) : 42-45. https://fraser.stlouisfed.org/title/43/item/7544/toc/187183 , accessed on May 9, 2024.
United States. Bureau of the Census. "NBER Short List," in United States. Bureau of the Census. "July 1970," Business Conditions Digest (July 1970) : 42-45. https://fraser.stlouisfed.org/title/43/item/7544/toc/187183 , accessed on May 9, 2024.