United States. Bureau of the Census. "Contents," in United States. Bureau of the Census. "February 1967," Business Conditions Digest (February 1967) : 3-4. https://fraser.stlouisfed.org/title/43/item/7236/toc/169871 , accessed on March 28, 2024.
United States. Bureau of the Census. "Contents," in United States. Bureau of the Census. "February 1967," Business Conditions Digest (February 1967) : 3-4. https://fraser.stlouisfed.org/title/43/item/7236/toc/169871 , accessed on March 28, 2024.