United States. Bureau of the Census. "June 1966," Business Conditions Digest (June 1966). https://fraser.stlouisfed.org/title/43/item/7228, accessed on July 11, 2024.
United States. Bureau of the Census. "June 1966," Business Conditions Digest (June 1966). https://fraser.stlouisfed.org/title/43/item/7228, accessed on July 11, 2024.