United States. Bureau of the Census. "NBER Short List," in United States. Bureau of the Census. "April 1973," Business Conditions Digest (April 1973) : 45-48. https://fraser.stlouisfed.org/title/43/item/7320/toc/212857 , accessed on April 25, 2024.
United States. Bureau of the Census. "NBER Short List," in United States. Bureau of the Census. "April 1973," Business Conditions Digest (April 1973) : 45-48. https://fraser.stlouisfed.org/title/43/item/7320/toc/212857 , accessed on April 25, 2024.