United States. Bureau of the Census. "Composite Indexes," in United States. Bureau of the Census. "March 1973," Business Conditions Digest (March 1973) : 89-89. https://fraser.stlouisfed.org/title/43/item/7319/toc/153768 , accessed on May 9, 2024.
United States. Bureau of the Census. "Composite Indexes," in United States. Bureau of the Census. "March 1973," Business Conditions Digest (March 1973) : 89-89. https://fraser.stlouisfed.org/title/43/item/7319/toc/153768 , accessed on May 9, 2024.