United States. Bureau of the Census. "Rates of Change," in United States. Bureau of the Census. "June 1971," Business Conditions Digest (June 1971) : 67-67. https://fraser.stlouisfed.org/title/43/item/7555/toc/237483 , accessed on May 13, 2024.
United States. Bureau of the Census. "Rates of Change," in United States. Bureau of the Census. "June 1971," Business Conditions Digest (June 1971) : 67-67. https://fraser.stlouisfed.org/title/43/item/7555/toc/237483 , accessed on May 13, 2024.