United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "March 1977," Business Conditions Digest (March 1977) : 1-1. https://fraser.stlouisfed.org/title/43/item/7367/toc/276380 , accessed on April 25, 2024.
United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "March 1977," Business Conditions Digest (March 1977) : 1-1. https://fraser.stlouisfed.org/title/43/item/7367/toc/276380 , accessed on April 25, 2024.