United States. Bureau of the Census. "December 1975," Business Conditions Digest (December 1975). https://fraser.stlouisfed.org/title/43/item/7352, accessed on April 18, 2024.
United States. Bureau of the Census. "December 1975," Business Conditions Digest (December 1975). https://fraser.stlouisfed.org/title/43/item/7352, accessed on April 18, 2024.