United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "December 1974," Business Conditions Digest (December 1974) : 1-1. https://fraser.stlouisfed.org/title/43/item/7340/toc/214106 , accessed on May 4, 2024.
United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "December 1974," Business Conditions Digest (December 1974) : 1-1. https://fraser.stlouisfed.org/title/43/item/7340/toc/214106 , accessed on May 4, 2024.