United States. Bureau of the Census. "Title Page," in United States. Bureau of the Census. "March 1972," Business Conditions Digest (March 1972) : 2-2. https://fraser.stlouisfed.org/title/43/item/7564/toc/378546 , accessed on March 29, 2024.
United States. Bureau of the Census. "Title Page," in United States. Bureau of the Census. "March 1972," Business Conditions Digest (March 1972) : 2-2. https://fraser.stlouisfed.org/title/43/item/7564/toc/378546 , accessed on March 29, 2024.