United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "December 1972," Business Conditions Digest (December 1972) : 1-1. https://fraser.stlouisfed.org/title/43/item/7316/toc/148268 , accessed on April 25, 2024.
United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "December 1972," Business Conditions Digest (December 1972) : 1-1. https://fraser.stlouisfed.org/title/43/item/7316/toc/148268 , accessed on April 25, 2024.