United States. Bureau of the Census. "Composite Indexes," in United States. Bureau of the Census. "May 1973," Business Conditions Digest (May 1973) : 43-44. https://fraser.stlouisfed.org/title/43/item/7321/toc/34341 , accessed on April 25, 2024.
United States. Bureau of the Census. "Composite Indexes," in United States. Bureau of the Census. "May 1973," Business Conditions Digest (May 1973) : 43-44. https://fraser.stlouisfed.org/title/43/item/7321/toc/34341 , accessed on April 25, 2024.