United States. Bureau of the Census. "Title Page," in United States. Bureau of the Census. "December 1975," Business Conditions Digest (December 1975) : 2-2. https://fraser.stlouisfed.org/title/43/item/7352/toc/145557 , accessed on April 30, 2024.
United States. Bureau of the Census. "Title Page," in United States. Bureau of the Census. "December 1975," Business Conditions Digest (December 1975) : 2-2. https://fraser.stlouisfed.org/title/43/item/7352/toc/145557 , accessed on April 30, 2024.