United States. Bureau of the Census. "Aggregate Series," in United States. Bureau of the Census. "July 1974," Business Conditions Digest (July 1974) : 49-51. https://fraser.stlouisfed.org/title/43/item/7335/toc/332320 , accessed on May 9, 2024.
United States. Bureau of the Census. "Aggregate Series," in United States. Bureau of the Census. "July 1974," Business Conditions Digest (July 1974) : 49-51. https://fraser.stlouisfed.org/title/43/item/7335/toc/332320 , accessed on May 9, 2024.