United States. Bureau of the Census. "Title Page," in United States. Bureau of the Census. "September 1980," Business Conditions Digest (September 1980) : 2-2. https://fraser.stlouisfed.org/title/43/item/7409/toc/103030 , accessed on April 25, 2024.
United States. Bureau of the Census. "Title Page," in United States. Bureau of the Census. "September 1980," Business Conditions Digest (September 1980) : 2-2. https://fraser.stlouisfed.org/title/43/item/7409/toc/103030 , accessed on April 25, 2024.