United States. Bureau of the Census. "Cyclical Indicators," in United States. Bureau of the Census. "July 1975," Business Conditions Digest (July 1975) : 30-53. https://fraser.stlouisfed.org/title/43/item/7347/toc/239339 , accessed on June 27, 2024.
United States. Bureau of the Census. "Cyclical Indicators," in United States. Bureau of the Census. "July 1975," Business Conditions Digest (July 1975) : 30-53. https://fraser.stlouisfed.org/title/43/item/7347/toc/239339 , accessed on June 27, 2024.