United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "June 1975," Business Conditions Digest (June 1975) : 1-1. https://fraser.stlouisfed.org/title/43/item/7346/toc/263711 , accessed on May 9, 2024.
United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "June 1975," Business Conditions Digest (June 1975) : 1-1. https://fraser.stlouisfed.org/title/43/item/7346/toc/263711 , accessed on May 9, 2024.