United States. Bureau of the Census. "NBER Short List," in United States. Bureau of the Census. "July 1971," Business Conditions Digest (July 1971) : 42-45. https://fraser.stlouisfed.org/title/43/item/7556/toc/149229 , accessed on April 25, 2024.
United States. Bureau of the Census. "NBER Short List," in United States. Bureau of the Census. "July 1971," Business Conditions Digest (July 1971) : 42-45. https://fraser.stlouisfed.org/title/43/item/7556/toc/149229 , accessed on April 25, 2024.