United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "February 1972," Business Conditions Digest (February 1972) : 1-1. https://fraser.stlouisfed.org/title/43/item/7563/toc/47382 , accessed on May 4, 2024.
United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "February 1972," Business Conditions Digest (February 1972) : 1-1. https://fraser.stlouisfed.org/title/43/item/7563/toc/47382 , accessed on May 4, 2024.