United States. Bureau of the Census. "Contents," in United States. Bureau of the Census. "May 1966," Business Conditions Digest (May 1966) : 3-4. https://fraser.stlouisfed.org/title/43/item/7227/toc/383999 , accessed on April 25, 2024.
United States. Bureau of the Census. "Contents," in United States. Bureau of the Census. "May 1966," Business Conditions Digest (May 1966) : 3-4. https://fraser.stlouisfed.org/title/43/item/7227/toc/383999 , accessed on April 25, 2024.