United States. Bureau of the Census. "Analytical Ratios," in United States. Bureau of the Census. "April 1974," Business Conditions Digest (April 1974) : 68-68. https://fraser.stlouisfed.org/title/43/item/7332/toc/263418 , accessed on May 9, 2024.
United States. Bureau of the Census. "Analytical Ratios," in United States. Bureau of the Census. "April 1974," Business Conditions Digest (April 1974) : 68-68. https://fraser.stlouisfed.org/title/43/item/7332/toc/263418 , accessed on May 9, 2024.