United States. Bureau of the Census. "Aggregate Series," in United States. Bureau of the Census. "June 1973," Business Conditions Digest (June 1973) : 49-51. https://fraser.stlouisfed.org/title/43/item/7322/toc/166879 , accessed on April 19, 2024.
United States. Bureau of the Census. "Aggregate Series," in United States. Bureau of the Census. "June 1973," Business Conditions Digest (June 1973) : 49-51. https://fraser.stlouisfed.org/title/43/item/7322/toc/166879 , accessed on April 19, 2024.