United States. Bureau of the Census. "Title Page," in United States. Bureau of the Census. "September 1973," Business Conditions Digest (September 1973) : 2-2. https://fraser.stlouisfed.org/title/43/item/7325/toc/394297 , accessed on April 30, 2024.
United States. Bureau of the Census. "Title Page," in United States. Bureau of the Census. "September 1973," Business Conditions Digest (September 1973) : 2-2. https://fraser.stlouisfed.org/title/43/item/7325/toc/394297 , accessed on April 30, 2024.