United States. Bureau of the Census. "Contents," in United States. Bureau of the Census. "December 1966," Business Conditions Digest (December 1966) : 1-2. https://fraser.stlouisfed.org/title/43/item/7234/toc/369811 , accessed on April 25, 2024.
United States. Bureau of the Census. "Contents," in United States. Bureau of the Census. "December 1966," Business Conditions Digest (December 1966) : 1-2. https://fraser.stlouisfed.org/title/43/item/7234/toc/369811 , accessed on April 25, 2024.