United States. Bureau of the Census. "Contents," in United States. Bureau of the Census. "August 1967," Business Conditions Digest (August 1967) : 3-4. https://fraser.stlouisfed.org/title/43/item/7242/toc/195338 , accessed on March 29, 2024.
United States. Bureau of the Census. "Contents," in United States. Bureau of the Census. "August 1967," Business Conditions Digest (August 1967) : 3-4. https://fraser.stlouisfed.org/title/43/item/7242/toc/195338 , accessed on March 29, 2024.