United States. Bureau of the Census. "Analytical Ratios," in United States. Bureau of the Census. "March 1974," Business Conditions Digest (March 1974) : 68-68. https://fraser.stlouisfed.org/title/43/item/7331/toc/53267 , accessed on April 25, 2024.
United States. Bureau of the Census. "Analytical Ratios," in United States. Bureau of the Census. "March 1974," Business Conditions Digest (March 1974) : 68-68. https://fraser.stlouisfed.org/title/43/item/7331/toc/53267 , accessed on April 25, 2024.