United States. Bureau of the Census. "NBER Short List," in United States. Bureau of the Census. "August 1969," Business Conditions Digest (August 1969) : 42-45. https://fraser.stlouisfed.org/title/43/item/7533/toc/216364 , accessed on May 3, 2024.
United States. Bureau of the Census. "NBER Short List," in United States. Bureau of the Census. "August 1969," Business Conditions Digest (August 1969) : 42-45. https://fraser.stlouisfed.org/title/43/item/7533/toc/216364 , accessed on May 3, 2024.