United States. Bureau of the Census. "Title Page," in United States. Bureau of the Census. "January 1981," Business Conditions Digest (January 1981) : 2-2. https://fraser.stlouisfed.org/title/43/item/7413/toc/140403 , accessed on April 24, 2024.
United States. Bureau of the Census. "Title Page," in United States. Bureau of the Census. "January 1981," Business Conditions Digest (January 1981) : 2-2. https://fraser.stlouisfed.org/title/43/item/7413/toc/140403 , accessed on April 24, 2024.