United States. Bureau of the Census. "Title Page," in United States. Bureau of the Census. "January 1967," Business Conditions Digest (January 1967) : 2-2. https://fraser.stlouisfed.org/title/43/item/7235/toc/216558 , accessed on May 5, 2024.
United States. Bureau of the Census. "Title Page," in United States. Bureau of the Census. "January 1967," Business Conditions Digest (January 1967) : 2-2. https://fraser.stlouisfed.org/title/43/item/7235/toc/216558 , accessed on May 5, 2024.