United States. Bureau of the Census. "Table of Contents," in United States. Bureau of the Census. "March 1977," Business Conditions Digest (March 1977) : 3-4. https://fraser.stlouisfed.org/title/43/item/7367/toc/276382 , accessed on March 28, 2024.
United States. Bureau of the Census. "Table of Contents," in United States. Bureau of the Census. "March 1977," Business Conditions Digest (March 1977) : 3-4. https://fraser.stlouisfed.org/title/43/item/7367/toc/276382 , accessed on March 28, 2024.