United States. Bureau of the Census. "Table of Contents," in United States. Bureau of the Census. "April 1973," Business Conditions Digest (April 1973) : 3-4. https://fraser.stlouisfed.org/title/43/item/7320/toc/212832 , accessed on April 18, 2024.
United States. Bureau of the Census. "Table of Contents," in United States. Bureau of the Census. "April 1973," Business Conditions Digest (April 1973) : 3-4. https://fraser.stlouisfed.org/title/43/item/7320/toc/212832 , accessed on April 18, 2024.