United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "October 1972," Business Conditions Digest (October 1972) : 1-1. https://fraser.stlouisfed.org/title/43/item/7314/toc/318985 , accessed on April 27, 2024.
United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "October 1972," Business Conditions Digest (October 1972) : 1-1. https://fraser.stlouisfed.org/title/43/item/7314/toc/318985 , accessed on April 27, 2024.