United States. Bureau of the Census. "Composite Indexes," in United States. Bureau of the Census. "July 1974," Business Conditions Digest (July 1974) : 89-89. https://fraser.stlouisfed.org/title/43/item/7335/toc/332353 , accessed on April 23, 2024.
United States. Bureau of the Census. "Composite Indexes," in United States. Bureau of the Census. "July 1974," Business Conditions Digest (July 1974) : 89-89. https://fraser.stlouisfed.org/title/43/item/7335/toc/332353 , accessed on April 23, 2024.