United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "July 1967," Business Conditions Digest (July 1967) : 1-1. https://fraser.stlouisfed.org/title/43/item/7241/toc/221714 , accessed on March 29, 2024.
United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "July 1967," Business Conditions Digest (July 1967) : 1-1. https://fraser.stlouisfed.org/title/43/item/7241/toc/221714 , accessed on March 29, 2024.