United States. Bureau of the Census. "February 1969," Business Conditions Digest (February 1969). https://fraser.stlouisfed.org/title/43/item/7527, accessed on May 9, 2024.
United States. Bureau of the Census. "February 1969," Business Conditions Digest (February 1969). https://fraser.stlouisfed.org/title/43/item/7527, accessed on May 9, 2024.