United States. Bureau of the Census. "NBER Short List," in United States. Bureau of the Census. "April 1972," Business Conditions Digest (April 1972) : 45-48. https://fraser.stlouisfed.org/title/43/item/7565/toc/54924 , accessed on April 25, 2024.
United States. Bureau of the Census. "NBER Short List," in United States. Bureau of the Census. "April 1972," Business Conditions Digest (April 1972) : 45-48. https://fraser.stlouisfed.org/title/43/item/7565/toc/54924 , accessed on April 25, 2024.