United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "July 1977," Business Conditions Digest (July 1977) : 1-1. https://fraser.stlouisfed.org/title/43/item/7371/toc/219032 , accessed on April 23, 2024.
United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "July 1977," Business Conditions Digest (July 1977) : 1-1. https://fraser.stlouisfed.org/title/43/item/7371/toc/219032 , accessed on April 23, 2024.