United States. Bureau of the Census. "Title Page," in United States. Bureau of the Census. "February 1971," Business Conditions Digest (February 1971) : 2-2. https://fraser.stlouisfed.org/title/43/item/7551/toc/40712 , accessed on March 29, 2024.
United States. Bureau of the Census. "Title Page," in United States. Bureau of the Census. "February 1971," Business Conditions Digest (February 1971) : 2-2. https://fraser.stlouisfed.org/title/43/item/7551/toc/40712 , accessed on March 29, 2024.