United States. Bureau of the Census. "NBER Short List," in United States. Bureau of the Census. "June 1972," Business Conditions Digest (June 1972) : 45-48. https://fraser.stlouisfed.org/title/43/item/7567/toc/381422 , accessed on April 19, 2024.
United States. Bureau of the Census. "NBER Short List," in United States. Bureau of the Census. "June 1972," Business Conditions Digest (June 1972) : 45-48. https://fraser.stlouisfed.org/title/43/item/7567/toc/381422 , accessed on April 19, 2024.