United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "February 1977," Business Conditions Digest (February 1977) : 1-1. https://fraser.stlouisfed.org/title/43/item/7366/toc/298144 , accessed on April 28, 2024.
United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "February 1977," Business Conditions Digest (February 1977) : 1-1. https://fraser.stlouisfed.org/title/43/item/7366/toc/298144 , accessed on April 28, 2024.