United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "December 1975," Business Conditions Digest (December 1975) : 1-1. https://fraser.stlouisfed.org/title/43/item/7352/toc/145556 , accessed on May 1, 2024.
United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "December 1975," Business Conditions Digest (December 1975) : 1-1. https://fraser.stlouisfed.org/title/43/item/7352/toc/145556 , accessed on May 1, 2024.