United States. Bureau of the Census. "Table of Contents," in United States. Bureau of the Census. "August 1981," Business Conditions Digest (August 1981) : 3-4. https://fraser.stlouisfed.org/title/43/item/7420/toc/89310 , accessed on April 17, 2024.
United States. Bureau of the Census. "Table of Contents," in United States. Bureau of the Census. "August 1981," Business Conditions Digest (August 1981) : 3-4. https://fraser.stlouisfed.org/title/43/item/7420/toc/89310 , accessed on April 17, 2024.