United States. Bureau of the Census. "Cyclical Indicators," in United States. Bureau of the Census. "July 1973," Business Conditions Digest (July 1973) : 12-13. https://fraser.stlouisfed.org/title/43/item/7323/toc/158462 , accessed on May 10, 2024.
United States. Bureau of the Census. "Cyclical Indicators," in United States. Bureau of the Census. "July 1973," Business Conditions Digest (July 1973) : 12-13. https://fraser.stlouisfed.org/title/43/item/7323/toc/158462 , accessed on May 10, 2024.