United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "June 1977," Business Conditions Digest (June 1977) : 1-1. https://fraser.stlouisfed.org/title/43/item/7370/toc/175348 , accessed on April 25, 2024.
United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "June 1977," Business Conditions Digest (June 1977) : 1-1. https://fraser.stlouisfed.org/title/43/item/7370/toc/175348 , accessed on April 25, 2024.