United States. Bureau of the Census. "NBER Leading Indicators," in United States. Bureau of the Census. "May 1966," Business Conditions Digest (May 1966) : 48-49. https://fraser.stlouisfed.org/title/43/item/7227/toc/384017 , accessed on May 1, 2024.
United States. Bureau of the Census. "NBER Leading Indicators," in United States. Bureau of the Census. "May 1966," Business Conditions Digest (May 1966) : 48-49. https://fraser.stlouisfed.org/title/43/item/7227/toc/384017 , accessed on May 1, 2024.