United States. Bureau of the Census. "NBER Short List," in United States. Bureau of the Census. "August 1970," Business Conditions Digest (August 1970) : 42-45. https://fraser.stlouisfed.org/title/43/item/7545/toc/352927 , accessed on May 7, 2024.
United States. Bureau of the Census. "NBER Short List," in United States. Bureau of the Census. "August 1970," Business Conditions Digest (August 1970) : 42-45. https://fraser.stlouisfed.org/title/43/item/7545/toc/352927 , accessed on May 7, 2024.