United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "November 1971," Business Conditions Digest (November 1971) : 1-1. https://fraser.stlouisfed.org/title/43/item/7560/toc/180772 , accessed on June 27, 2024.
United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "November 1971," Business Conditions Digest (November 1971) : 1-1. https://fraser.stlouisfed.org/title/43/item/7560/toc/180772 , accessed on June 27, 2024.