United States. Bureau of the Census. "Aggregate Series," in United States. Bureau of the Census. "August 1973," Business Conditions Digest (August 1973) : 90-90. https://fraser.stlouisfed.org/title/43/item/7324/toc/311038 , accessed on May 3, 2024.
United States. Bureau of the Census. "Aggregate Series," in United States. Bureau of the Census. "August 1973," Business Conditions Digest (August 1973) : 90-90. https://fraser.stlouisfed.org/title/43/item/7324/toc/311038 , accessed on May 3, 2024.