United States. Bureau of the Census. "January 1977," Business Conditions Digest (January 1977). https://fraser.stlouisfed.org/title/43/item/7365, accessed on April 24, 2024.
United States. Bureau of the Census. "January 1977," Business Conditions Digest (January 1977). https://fraser.stlouisfed.org/title/43/item/7365, accessed on April 24, 2024.