United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "March 1973," Business Conditions Digest (March 1973) : 1-1. https://fraser.stlouisfed.org/title/43/item/7319/toc/153707 , accessed on April 23, 2024.
United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "March 1973," Business Conditions Digest (March 1973) : 1-1. https://fraser.stlouisfed.org/title/43/item/7319/toc/153707 , accessed on April 23, 2024.