United States. Bureau of the Census. "Rates of Change," in United States. Bureau of the Census. "April 1975," Business Conditions Digest (April 1975) : 71-71. https://fraser.stlouisfed.org/title/43/item/7344/toc/176704 , accessed on April 26, 2024.
United States. Bureau of the Census. "Rates of Change," in United States. Bureau of the Census. "April 1975," Business Conditions Digest (April 1975) : 71-71. https://fraser.stlouisfed.org/title/43/item/7344/toc/176704 , accessed on April 26, 2024.