United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "October 1981," Business Conditions Digest (October 1981) : 1-1. https://fraser.stlouisfed.org/title/43/item/7422/toc/181343 , accessed on April 19, 2024.
United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "October 1981," Business Conditions Digest (October 1981) : 1-1. https://fraser.stlouisfed.org/title/43/item/7422/toc/181343 , accessed on April 19, 2024.