United States. Bureau of the Census. "Table of Contents," in United States. Bureau of the Census. "June 1977," Business Conditions Digest (June 1977) : 3-4. https://fraser.stlouisfed.org/title/43/item/7370/toc/175350 , accessed on April 19, 2024.
United States. Bureau of the Census. "Table of Contents," in United States. Bureau of the Census. "June 1977," Business Conditions Digest (June 1977) : 3-4. https://fraser.stlouisfed.org/title/43/item/7370/toc/175350 , accessed on April 19, 2024.