United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "July 1980," Business Conditions Digest (July 1980) : 1-1. https://fraser.stlouisfed.org/title/43/item/7407/toc/338737 , accessed on April 23, 2024.
United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "July 1980," Business Conditions Digest (July 1980) : 1-1. https://fraser.stlouisfed.org/title/43/item/7407/toc/338737 , accessed on April 23, 2024.