United States. Bureau of the Census. "Composite Indexes," in United States. Bureau of the Census. "June 1975," Business Conditions Digest (June 1975) : 47-48. https://fraser.stlouisfed.org/title/43/item/7346/toc/263737 , accessed on April 19, 2024.
United States. Bureau of the Census. "Composite Indexes," in United States. Bureau of the Census. "June 1975," Business Conditions Digest (June 1975) : 47-48. https://fraser.stlouisfed.org/title/43/item/7346/toc/263737 , accessed on April 19, 2024.