United States. Bureau of the Census. "Contents," in United States. Bureau of the Census. "January 1967," Business Conditions Digest (January 1967) : 3-4. https://fraser.stlouisfed.org/title/43/item/7235/toc/216559 , accessed on April 24, 2024.
United States. Bureau of the Census. "Contents," in United States. Bureau of the Census. "January 1967," Business Conditions Digest (January 1967) : 3-4. https://fraser.stlouisfed.org/title/43/item/7235/toc/216559 , accessed on April 24, 2024.