United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "November 1967," Business Conditions Digest (November 1967) : 1-1. https://fraser.stlouisfed.org/title/43/item/7245/toc/73412 , accessed on May 11, 2024.
United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "November 1967," Business Conditions Digest (November 1967) : 1-1. https://fraser.stlouisfed.org/title/43/item/7245/toc/73412 , accessed on May 11, 2024.