United States. Bureau of the Census. "Composite Indexes," in United States. Bureau of the Census. "July 1977," Business Conditions Digest (July 1977) : 65-65. https://fraser.stlouisfed.org/title/43/item/7371/toc/219066 , accessed on May 14, 2024.
United States. Bureau of the Census. "Composite Indexes," in United States. Bureau of the Census. "July 1977," Business Conditions Digest (July 1977) : 65-65. https://fraser.stlouisfed.org/title/43/item/7371/toc/219066 , accessed on May 14, 2024.