United States. Bureau of the Census. "Title Page," in United States. Bureau of the Census. "February 1972," Business Conditions Digest (February 1972) : 2-2. https://fraser.stlouisfed.org/title/43/item/7563/toc/47383 , accessed on May 8, 2024.
United States. Bureau of the Census. "Title Page," in United States. Bureau of the Census. "February 1972," Business Conditions Digest (February 1972) : 2-2. https://fraser.stlouisfed.org/title/43/item/7563/toc/47383 , accessed on May 8, 2024.