United States. Bureau of the Census. "Title Page," in United States. Bureau of the Census. "December 1980," Business Conditions Digest (December 1980) : 2-2. https://fraser.stlouisfed.org/title/43/item/7412/toc/287034 , accessed on April 19, 2024.
United States. Bureau of the Census. "Title Page," in United States. Bureau of the Census. "December 1980," Business Conditions Digest (December 1980) : 2-2. https://fraser.stlouisfed.org/title/43/item/7412/toc/287034 , accessed on April 19, 2024.