United States. Bureau of the Census. "Contents," in United States. Bureau of the Census. "September 1966," Business Conditions Digest (September 1966) : 1-2. https://fraser.stlouisfed.org/title/43/item/7231/toc/407487 , accessed on April 18, 2024.
United States. Bureau of the Census. "Contents," in United States. Bureau of the Census. "September 1966," Business Conditions Digest (September 1966) : 1-2. https://fraser.stlouisfed.org/title/43/item/7231/toc/407487 , accessed on April 18, 2024.