United States. Bureau of the Census. "Aggregate Series," in United States. Bureau of the Census. "May 1974," Business Conditions Digest (May 1974) : 49-51. https://fraser.stlouisfed.org/title/43/item/7333/toc/382273 , accessed on March 29, 2024.
United States. Bureau of the Census. "Aggregate Series," in United States. Bureau of the Census. "May 1974," Business Conditions Digest (May 1974) : 49-51. https://fraser.stlouisfed.org/title/43/item/7333/toc/382273 , accessed on March 29, 2024.