United States. Bureau of the Census. "Rates of Change," in United States. Bureau of the Census. "April 1970," Business Conditions Digest (April 1970) : 67-67. https://fraser.stlouisfed.org/title/43/item/7541/toc/179571 , accessed on April 24, 2024.
United States. Bureau of the Census. "Rates of Change," in United States. Bureau of the Census. "April 1970," Business Conditions Digest (April 1970) : 67-67. https://fraser.stlouisfed.org/title/43/item/7541/toc/179571 , accessed on April 24, 2024.