United States. Bureau of the Census. "Title Page," in United States. Bureau of the Census. "December 1977," Business Conditions Digest (December 1977) : 2-2. https://fraser.stlouisfed.org/title/43/item/7376/toc/367962 , accessed on April 25, 2024.
United States. Bureau of the Census. "Title Page," in United States. Bureau of the Census. "December 1977," Business Conditions Digest (December 1977) : 2-2. https://fraser.stlouisfed.org/title/43/item/7376/toc/367962 , accessed on April 25, 2024.