United States. Bureau of the Census. "Composite Indexes," in United States. Bureau of the Census. "June 1974," Business Conditions Digest (June 1974) : 89-89. https://fraser.stlouisfed.org/title/43/item/7334/toc/353948 , accessed on April 27, 2024.
United States. Bureau of the Census. "Composite Indexes," in United States. Bureau of the Census. "June 1974," Business Conditions Digest (June 1974) : 89-89. https://fraser.stlouisfed.org/title/43/item/7334/toc/353948 , accessed on April 27, 2024.