United States. Bureau of the Census. "February 1966," Business Conditions Digest (February 1966). https://fraser.stlouisfed.org/title/43/item/7224, accessed on July 11, 2024.
United States. Bureau of the Census. "February 1966," Business Conditions Digest (February 1966). https://fraser.stlouisfed.org/title/43/item/7224, accessed on July 11, 2024.