United States. Bureau of the Census. "Composite Indexes," in United States. Bureau of the Census. "July 1976," Business Conditions Digest (July 1976) : 89-89. https://fraser.stlouisfed.org/title/43/item/7359/toc/244153 , accessed on April 23, 2024.
United States. Bureau of the Census. "Composite Indexes," in United States. Bureau of the Census. "July 1976," Business Conditions Digest (July 1976) : 89-89. https://fraser.stlouisfed.org/title/43/item/7359/toc/244153 , accessed on April 23, 2024.