United States. Bureau of the Census. "NBER Short List," in United States. Bureau of the Census. "October 1971," Business Conditions Digest (October 1971) : 42-45. https://fraser.stlouisfed.org/title/43/item/7559/toc/141381 , accessed on May 7, 2024.
United States. Bureau of the Census. "NBER Short List," in United States. Bureau of the Census. "October 1971," Business Conditions Digest (October 1971) : 42-45. https://fraser.stlouisfed.org/title/43/item/7559/toc/141381 , accessed on May 7, 2024.