United States. Bureau of the Census. "July 1979," Business Conditions Digest (July 1979). https://fraser.stlouisfed.org/title/43/item/7395, accessed on April 26, 2024.
United States. Bureau of the Census. "July 1979," Business Conditions Digest (July 1979). https://fraser.stlouisfed.org/title/43/item/7395, accessed on April 26, 2024.