United States. Bureau of the Census. "May 1980," Business Conditions Digest (May 1980). https://fraser.stlouisfed.org/title/43/item/7405, accessed on March 28, 2024.
United States. Bureau of the Census. "May 1980," Business Conditions Digest (May 1980). https://fraser.stlouisfed.org/title/43/item/7405, accessed on March 28, 2024.