United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "October 1967," Business Conditions Digest (October 1967) : 1-1. https://fraser.stlouisfed.org/title/43/item/7244/toc/200487 , accessed on March 28, 2024.
United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "October 1967," Business Conditions Digest (October 1967) : 1-1. https://fraser.stlouisfed.org/title/43/item/7244/toc/200487 , accessed on March 28, 2024.