United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "April 1974," Business Conditions Digest (April 1974) : 1-1. https://fraser.stlouisfed.org/title/43/item/7332/toc/263381 , accessed on May 6, 2024.
United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "April 1974," Business Conditions Digest (April 1974) : 1-1. https://fraser.stlouisfed.org/title/43/item/7332/toc/263381 , accessed on May 6, 2024.