United States. Bureau of the Census. "Aggregate Series," in United States. Bureau of the Census. "June 1974," Business Conditions Digest (June 1974) : 49-51. https://fraser.stlouisfed.org/title/43/item/7334/toc/353933 , accessed on April 25, 2024.
United States. Bureau of the Census. "Aggregate Series," in United States. Bureau of the Census. "June 1974," Business Conditions Digest (June 1974) : 49-51. https://fraser.stlouisfed.org/title/43/item/7334/toc/353933 , accessed on April 25, 2024.