United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "September 1973," Business Conditions Digest (September 1973) : 1-1. https://fraser.stlouisfed.org/title/43/item/7325/toc/394296 , accessed on May 4, 2024.
United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "September 1973," Business Conditions Digest (September 1973) : 1-1. https://fraser.stlouisfed.org/title/43/item/7325/toc/394296 , accessed on May 4, 2024.