United States. Bureau of the Census. "Lagging Indicators," in United States. Bureau of the Census. "July 1967," Business Conditions Digest (July 1967) : 47-48. https://fraser.stlouisfed.org/title/43/item/7241/toc/221732 , accessed on July 11, 2024.
United States. Bureau of the Census. "Lagging Indicators," in United States. Bureau of the Census. "July 1967," Business Conditions Digest (July 1967) : 47-48. https://fraser.stlouisfed.org/title/43/item/7241/toc/221732 , accessed on July 11, 2024.