United States. Bureau of the Census. "July 1980," Business Conditions Digest (July 1980). https://fraser.stlouisfed.org/title/43/item/7407, accessed on April 25, 2024.
United States. Bureau of the Census. "July 1980," Business Conditions Digest (July 1980). https://fraser.stlouisfed.org/title/43/item/7407, accessed on April 25, 2024.