United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "September 1979," Business Conditions Digest (September 1979) : 1-1. https://fraser.stlouisfed.org/title/43/item/7397/toc/732 , accessed on April 18, 2024.
United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "September 1979," Business Conditions Digest (September 1979) : 1-1. https://fraser.stlouisfed.org/title/43/item/7397/toc/732 , accessed on April 18, 2024.