United States. Bureau of the Census. "December 1980," Business Conditions Digest (December 1980). https://fraser.stlouisfed.org/title/43/item/7412, accessed on July 14, 2024.
United States. Bureau of the Census. "December 1980," Business Conditions Digest (December 1980). https://fraser.stlouisfed.org/title/43/item/7412, accessed on July 14, 2024.