United States. Bureau of the Census. "Title Page," in United States. Bureau of the Census. "October 1971," Business Conditions Digest (October 1971) : 2-2. https://fraser.stlouisfed.org/title/43/item/7559/toc/141357 , accessed on May 3, 2024.
United States. Bureau of the Census. "Title Page," in United States. Bureau of the Census. "October 1971," Business Conditions Digest (October 1971) : 2-2. https://fraser.stlouisfed.org/title/43/item/7559/toc/141357 , accessed on May 3, 2024.