United States. Bureau of the Census. "Analytical Measures," in United States. Bureau of the Census. "May 1974," Business Conditions Digest (May 1974) : 14-14. https://fraser.stlouisfed.org/title/43/item/7333/toc/382253 , accessed on April 18, 2024.
United States. Bureau of the Census. "Analytical Measures," in United States. Bureau of the Census. "May 1974," Business Conditions Digest (May 1974) : 14-14. https://fraser.stlouisfed.org/title/43/item/7333/toc/382253 , accessed on April 18, 2024.