United States. Bureau of the Census. "Analytical Ratios," in United States. Bureau of the Census. "May 1973," Business Conditions Digest (May 1973) : 68-68. https://fraser.stlouisfed.org/title/43/item/7321/toc/34352 , accessed on March 29, 2024.
United States. Bureau of the Census. "Analytical Ratios," in United States. Bureau of the Census. "May 1973," Business Conditions Digest (May 1973) : 68-68. https://fraser.stlouisfed.org/title/43/item/7321/toc/34352 , accessed on March 29, 2024.