United States. Bureau of the Census. "Title Page," in United States. Bureau of the Census. "November 1968," Business Conditions Digest (November 1968) : 2-2. https://fraser.stlouisfed.org/title/43/item/7524/toc/114880 , accessed on May 4, 2024.
United States. Bureau of the Census. "Title Page," in United States. Bureau of the Census. "November 1968," Business Conditions Digest (November 1968) : 2-2. https://fraser.stlouisfed.org/title/43/item/7524/toc/114880 , accessed on May 4, 2024.