United States. Bureau of the Census. "Contents," in United States. Bureau of the Census. "April 1966," Business Conditions Digest (April 1966) : 3-4. https://fraser.stlouisfed.org/title/43/item/7226/toc/178082 , accessed on April 19, 2024.
United States. Bureau of the Census. "Contents," in United States. Bureau of the Census. "April 1966," Business Conditions Digest (April 1966) : 3-4. https://fraser.stlouisfed.org/title/43/item/7226/toc/178082 , accessed on April 19, 2024.