United States. Bureau of the Census. "Title Page," in United States. Bureau of the Census. "January 1969," Business Conditions Digest (January 1969) : 2-2. https://fraser.stlouisfed.org/title/43/item/7526/toc/343845 , accessed on May 11, 2024.
United States. Bureau of the Census. "Title Page," in United States. Bureau of the Census. "January 1969," Business Conditions Digest (January 1969) : 2-2. https://fraser.stlouisfed.org/title/43/item/7526/toc/343845 , accessed on May 11, 2024.