United States. Bureau of the Census. "Title Page," in United States. Bureau of the Census. "May 1977," Business Conditions Digest (May 1977) : 2-2. https://fraser.stlouisfed.org/title/43/item/7369/toc/321279 , accessed on May 9, 2024.
United States. Bureau of the Census. "Title Page," in United States. Bureau of the Census. "May 1977," Business Conditions Digest (May 1977) : 2-2. https://fraser.stlouisfed.org/title/43/item/7369/toc/321279 , accessed on May 9, 2024.