United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "August 1970," Business Conditions Digest (August 1970) : 1-1. https://fraser.stlouisfed.org/title/43/item/7545/toc/352902 , accessed on March 28, 2024.
United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "August 1970," Business Conditions Digest (August 1970) : 1-1. https://fraser.stlouisfed.org/title/43/item/7545/toc/352902 , accessed on March 28, 2024.