United States. Bureau of the Census. "Composite Indexes," in United States. Bureau of the Census. "July 1975," Business Conditions Digest (July 1975) : 47-48. https://fraser.stlouisfed.org/title/43/item/7347/toc/239359 , accessed on April 23, 2024.
United States. Bureau of the Census. "Composite Indexes," in United States. Bureau of the Census. "July 1975," Business Conditions Digest (July 1975) : 47-48. https://fraser.stlouisfed.org/title/43/item/7347/toc/239359 , accessed on April 23, 2024.