United States. Bureau of the Census. "Consumers' Prices," in United States. Bureau of the Census. "May 1971," Business Conditions Digest (May 1971) : 68-68. https://fraser.stlouisfed.org/title/43/item/7554/toc/129396 , accessed on May 11, 2024.
United States. Bureau of the Census. "Consumers' Prices," in United States. Bureau of the Census. "May 1971," Business Conditions Digest (May 1971) : 68-68. https://fraser.stlouisfed.org/title/43/item/7554/toc/129396 , accessed on May 11, 2024.