United States. Bureau of the Census. "Rates of Change," in United States. Bureau of the Census. "May 1971," Business Conditions Digest (May 1971) : 67-67. https://fraser.stlouisfed.org/title/43/item/7554/toc/129395 , accessed on April 17, 2024.
United States. Bureau of the Census. "Rates of Change," in United States. Bureau of the Census. "May 1971," Business Conditions Digest (May 1971) : 67-67. https://fraser.stlouisfed.org/title/43/item/7554/toc/129395 , accessed on April 17, 2024.