United States. Bureau of the Census. "Table of Contents," in United States. Bureau of the Census. "June 1972," Business Conditions Digest (June 1972) : 3-4. https://fraser.stlouisfed.org/title/43/item/7567/toc/381397 , accessed on March 28, 2024.
United States. Bureau of the Census. "Table of Contents," in United States. Bureau of the Census. "June 1972," Business Conditions Digest (June 1972) : 3-4. https://fraser.stlouisfed.org/title/43/item/7567/toc/381397 , accessed on March 28, 2024.