United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "October 1970," Business Conditions Digest (October 1970) : 1-1. https://fraser.stlouisfed.org/title/43/item/7547/toc/124601 , accessed on April 18, 2024.
United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "October 1970," Business Conditions Digest (October 1970) : 1-1. https://fraser.stlouisfed.org/title/43/item/7547/toc/124601 , accessed on April 18, 2024.