United States. Bureau of the Census. "Table of Contents," in United States. Bureau of the Census. "October 1971," Business Conditions Digest (October 1971) : 3-4. https://fraser.stlouisfed.org/title/43/item/7559/toc/141358 , accessed on May 5, 2024.
United States. Bureau of the Census. "Table of Contents," in United States. Bureau of the Census. "October 1971," Business Conditions Digest (October 1971) : 3-4. https://fraser.stlouisfed.org/title/43/item/7559/toc/141358 , accessed on May 5, 2024.