United States. Bureau of the Census. "June 1977," Business Conditions Digest (June 1977). https://fraser.stlouisfed.org/title/43/item/7370, accessed on May 11, 2024.
United States. Bureau of the Census. "June 1977," Business Conditions Digest (June 1977). https://fraser.stlouisfed.org/title/43/item/7370, accessed on May 11, 2024.