United States. Bureau of the Census. "Title Page," in United States. Bureau of the Census. "September 1969," Business Conditions Digest (September 1969) : 2-2. https://fraser.stlouisfed.org/title/43/item/7534/toc/259294 , accessed on May 7, 2024.
United States. Bureau of the Census. "Title Page," in United States. Bureau of the Census. "September 1969," Business Conditions Digest (September 1969) : 2-2. https://fraser.stlouisfed.org/title/43/item/7534/toc/259294 , accessed on May 7, 2024.